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Finding the Fourth Proportional to 854.14, 1,281.28 and 625.87

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Solution

The fourth proportional to 854.14, 1,281.28 and 625.87 is: 938.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.14 : 1,281.28 = 625.87 : x
  2. Step 2: Convert to fraction form
    854.14/1,281.28 = 625.87/x
  3. Step 3: Cross multiply
    854.14x = 1,281.28 × 625.87
  4. Step 4: Simplify right side
    854.14x = 801,909.95
  5. Step 5: Solve for x
    x = 801,909.95/854.14
  6. Step 6: Final answer
    x = 938.85

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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.