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Finding the Fourth Proportional to 97.20, 145.07 and 87.48

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Solution

The fourth proportional to 97.20, 145.07 and 87.48 is: 130.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.20 : 145.07 = 87.48 : x
  2. Step 2: Convert to fraction form
    97.20/145.07 = 87.48/x
  3. Step 3: Cross multiply
    97.20x = 145.07 × 87.48
  4. Step 4: Simplify right side
    97.20x = 12,690.29
  5. Step 5: Solve for x
    x = 12,690.29/97.20
  6. Step 6: Final answer
    x = 130.56

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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.