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Finding the Fourth Proportional to 97.12, 145 and 74.17

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Solution

The fourth proportional to 97.12, 145 and 74.17 is: 110.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.12 : 145 = 74.17 : x
  2. Step 2: Convert to fraction form
    97.12/145 = 74.17/x
  3. Step 3: Cross multiply
    97.12x = 145 × 74.17
  4. Step 4: Simplify right side
    97.12x = 10,754.65
  5. Step 5: Solve for x
    x = 10,754.65/97.12
  6. Step 6: Final answer
    x = 110.74

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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.