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Finding the Fourth Proportional to 648,141.80, 972,212.70 and 611,400.20

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Solution

The fourth proportional to 648,141.80, 972,212.70 and 611,400.20 is: 917,100.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    648,141.80 : 972,212.70 = 611,400.20 : x
  2. Step 2: Convert to fraction form
    648,141.80/972,212.70 = 611,400.20/x
  3. Step 3: Cross multiply
    648,141.80x = 972,212.70 × 611,400.20
  4. Step 4: Simplify right side
    648,141.80x = 594,411,039,222.54
  5. Step 5: Solve for x
    x = 594,411,039,222.54/648,141.80
  6. Step 6: Final answer
    x = 917,100.30

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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.