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Finding the Fourth Proportional to 438.93, 658.49 and 130.79

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Solution

The fourth proportional to 438.93, 658.49 and 130.79 is: 196.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.93 : 658.49 = 130.79 : x
  2. Step 2: Convert to fraction form
    438.93/658.49 = 130.79/x
  3. Step 3: Cross multiply
    438.93x = 658.49 × 130.79
  4. Step 4: Simplify right side
    438.93x = 86,123.91
  5. Step 5: Solve for x
    x = 86,123.91/438.93
  6. Step 6: Final answer
    x = 196.21

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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.