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Finding the Fourth Proportional to 97.39, 145.68 and 74.31

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Solution

The fourth proportional to 97.39, 145.68 and 74.31 is: 111.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.39 : 145.68 = 74.31 : x
  2. Step 2: Convert to fraction form
    97.39/145.68 = 74.31/x
  3. Step 3: Cross multiply
    97.39x = 145.68 × 74.31
  4. Step 4: Simplify right side
    97.39x = 10,825.48
  5. Step 5: Solve for x
    x = 10,825.48/97.39
  6. Step 6: Final answer
    x = 111.16

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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.