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Finding the Fourth Proportional to 97.24, 145.20 and 85.08

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Solution

The fourth proportional to 97.24, 145.20 and 85.08 is: 127.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.24 : 145.20 = 85.08 : x
  2. Step 2: Convert to fraction form
    97.24/145.20 = 85.08/x
  3. Step 3: Cross multiply
    97.24x = 145.20 × 85.08
  4. Step 4: Simplify right side
    97.24x = 12,353.62
  5. Step 5: Solve for x
    x = 12,353.62/97.24
  6. Step 6: Final answer
    x = 127.04

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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.