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Finding the Fourth Proportional to 642,951.42, 887,268.78 and 356,471.43

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Solution

The fourth proportional to 642,951.42, 887,268.78 and 356,471.43 is: 491,928.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,951.42 : 887,268.78 = 356,471.43 : x
  2. Step 2: Convert to fraction form
    642,951.42/887,268.78 = 356,471.43/x
  3. Step 3: Cross multiply
    642,951.42x = 887,268.78 × 356,471.43
  4. Step 4: Simplify right side
    642,951.42x = 316,285,970,800.96
  5. Step 5: Solve for x
    x = 316,285,970,800.96/642,951.42
  6. Step 6: Final answer
    x = 491,928.26

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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.