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Finding the Fourth Proportional to 643,287.12, 887,776.50 and 371,404.86

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Solution

The fourth proportional to 643,287.12, 887,776.50 and 371,404.86 is: 512,561.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,287.12 : 887,776.50 = 371,404.86 : x
  2. Step 2: Convert to fraction form
    643,287.12/887,776.50 = 371,404.86/x
  3. Step 3: Cross multiply
    643,287.12x = 887,776.50 × 371,404.86
  4. Step 4: Simplify right side
    643,287.12x = 329,724,506,693.79
  5. Step 5: Solve for x
    x = 329,724,506,693.79/643,287.12
  6. Step 6: Final answer
    x = 512,561.96

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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.