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Finding the Fourth Proportional to 658.71, 987.80 and 247.63

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Solution

The fourth proportional to 658.71, 987.80 and 247.63 is: 371.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.71 : 987.80 = 247.63 : x
  2. Step 2: Convert to fraction form
    658.71/987.80 = 247.63/x
  3. Step 3: Cross multiply
    658.71x = 987.80 × 247.63
  4. Step 4: Simplify right side
    658.71x = 244,608.29
  5. Step 5: Solve for x
    x = 244,608.29/658.71
  6. Step 6: Final answer
    x = 371.34

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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.