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Finding the Fourth Proportional to 651,639.80, 977,459.70 and 561,438.20

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Solution

The fourth proportional to 651,639.80, 977,459.70 and 561,438.20 is: 842,157.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    651,639.80 : 977,459.70 = 561,438.20 : x
  2. Step 2: Convert to fraction form
    651,639.80/977,459.70 = 561,438.20/x
  3. Step 3: Cross multiply
    651,639.80x = 977,459.70 × 561,438.20
  4. Step 4: Simplify right side
    651,639.80x = 548,783,214,540.54
  5. Step 5: Solve for x
    x = 548,783,214,540.54/651,639.80
  6. Step 6: Final answer
    x = 842,157.30

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Double scale
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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.