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Finding the Fourth Proportional to 754.17, 1,128.71 and 539.15

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Solution

The fourth proportional to 754.17, 1,128.71 and 539.15 is: 806.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.17 : 1,128.71 = 539.15 : x
  2. Step 2: Convert to fraction form
    754.17/1,128.71 = 539.15/x
  3. Step 3: Cross multiply
    754.17x = 1,128.71 × 539.15
  4. Step 4: Simplify right side
    754.17x = 608,535.66
  5. Step 5: Solve for x
    x = 608,535.66/754.17
  6. Step 6: Final answer
    x = 806.89

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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.