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Finding the Fourth Proportional to 665,520.91, 918,088.22 and 393,456.29

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Solution

The fourth proportional to 665,520.91, 918,088.22 and 393,456.29 is: 542,774.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,520.91 : 918,088.22 = 393,456.29 : x
  2. Step 2: Convert to fraction form
    665,520.91/918,088.22 = 393,456.29/x
  3. Step 3: Cross multiply
    665,520.91x = 918,088.22 × 393,456.29
  4. Step 4: Simplify right side
    665,520.91x = 361,227,581,327.10
  5. Step 5: Solve for x
    x = 361,227,581,327.10/665,520.91
  6. Step 6: Final answer
    x = 542,774.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.