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Finding the Fourth Proportional to 611,872.90, 917,809.35 and 521,331.10

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Solution

The fourth proportional to 611,872.90, 917,809.35 and 521,331.10 is: 781,996.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,872.90 : 917,809.35 = 521,331.10 : x
  2. Step 2: Convert to fraction form
    611,872.90/917,809.35 = 521,331.10/x
  3. Step 3: Cross multiply
    611,872.90x = 917,809.35 × 521,331.10
  4. Step 4: Simplify right side
    611,872.90x = 478,482,558,025.79
  5. Step 5: Solve for x
    x = 478,482,558,025.79/611,872.90
  6. Step 6: Final answer
    x = 781,996.65

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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.