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Finding the Fourth Proportional to 651,705.80, 977,558.70 and 641,208.20

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Solution

The fourth proportional to 651,705.80, 977,558.70 and 641,208.20 is: 961,812.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    651,705.80 : 977,558.70 = 641,208.20 : x
  2. Step 2: Convert to fraction form
    651,705.80/977,558.70 = 641,208.20/x
  3. Step 3: Cross multiply
    651,705.80x = 977,558.70 × 641,208.20
  4. Step 4: Simplify right side
    651,705.80x = 626,818,654,421.34
  5. Step 5: Solve for x
    x = 626,818,654,421.34/651,705.80
  6. Step 6: Final answer
    x = 961,812.30

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.