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Finding the Fourth Proportional to 591.39, 817.17 and 487.71

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Solution

The fourth proportional to 591.39, 817.17 and 487.71 is: 673.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    591.39 : 817.17 = 487.71 : x
  2. Step 2: Convert to fraction form
    591.39/817.17 = 487.71/x
  3. Step 3: Cross multiply
    591.39x = 817.17 × 487.71
  4. Step 4: Simplify right side
    591.39x = 398,541.98
  5. Step 5: Solve for x
    x = 398,541.98/591.39
  6. Step 6: Final answer
    x = 673.91

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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.