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Finding the Fourth Proportional to 487.91, 731.91 and 163.31

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Solution

The fourth proportional to 487.91, 731.91 and 163.31 is: 244.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.91 : 731.91 = 163.31 : x
  2. Step 2: Convert to fraction form
    487.91/731.91 = 163.31/x
  3. Step 3: Cross multiply
    487.91x = 731.91 × 163.31
  4. Step 4: Simplify right side
    487.91x = 119,528.22
  5. Step 5: Solve for x
    x = 119,528.22/487.91
  6. Step 6: Final answer
    x = 244.98

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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.