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Finding the Fourth Proportional to 97.38, 145.31 and 84.42

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Solution

The fourth proportional to 97.38, 145.31 and 84.42 is: 125.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.38 : 145.31 = 84.42 : x
  2. Step 2: Convert to fraction form
    97.38/145.31 = 84.42/x
  3. Step 3: Cross multiply
    97.38x = 145.31 × 84.42
  4. Step 4: Simplify right side
    97.38x = 12,266.13
  5. Step 5: Solve for x
    x = 12,266.13/97.38
  6. Step 6: Final answer
    x = 125.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.