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Finding the Fourth Proportional to 947.92, 1,422.42 and 658.48

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Solution

The fourth proportional to 947.92, 1,422.42 and 658.48 is: 988.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.92 : 1,422.42 = 658.48 : x
  2. Step 2: Convert to fraction form
    947.92/1,422.42 = 658.48/x
  3. Step 3: Cross multiply
    947.92x = 1,422.42 × 658.48
  4. Step 4: Simplify right side
    947.92x = 936,635.12
  5. Step 5: Solve for x
    x = 936,635.12/947.92
  6. Step 6: Final answer
    x = 988.10

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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.