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Finding the Fourth Proportional to 97.21, 145.03 and 87.42

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Solution

The fourth proportional to 97.21, 145.03 and 87.42 is: 130.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.21 : 145.03 = 87.42 : x
  2. Step 2: Convert to fraction form
    97.21/145.03 = 87.42/x
  3. Step 3: Cross multiply
    97.21x = 145.03 × 87.42
  4. Step 4: Simplify right side
    97.21x = 12,678.30
  5. Step 5: Solve for x
    x = 12,678.30/97.21
  6. Step 6: Final answer
    x = 130.43

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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.