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Finding the Fourth Proportional to 611,807.40, 917,711.10 and 521,265.60

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Solution

The fourth proportional to 611,807.40, 917,711.10 and 521,265.60 is: 781,898.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,807.40 : 917,711.10 = 521,265.60 : x
  2. Step 2: Convert to fraction form
    611,807.40/917,711.10 = 521,265.60/x
  3. Step 3: Cross multiply
    611,807.40x = 917,711.10 × 521,265.60
  4. Step 4: Simplify right side
    611,807.40x = 478,371,227,168.16
  5. Step 5: Solve for x
    x = 478,371,227,168.16/611,807.40
  6. Step 6: Final answer
    x = 781,898.40

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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.