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Finding the Fourth Proportional to 487.71, 731.52 and 145.71

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Solution

The fourth proportional to 487.71, 731.52 and 145.71 is: 218.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.71 : 731.52 = 145.71 : x
  2. Step 2: Convert to fraction form
    487.71/731.52 = 145.71/x
  3. Step 3: Cross multiply
    487.71x = 731.52 × 145.71
  4. Step 4: Simplify right side
    487.71x = 106,589.78
  5. Step 5: Solve for x
    x = 106,589.78/487.71
  6. Step 6: Final answer
    x = 218.55

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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.