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Finding the Fourth Proportional to 99.57, 138.03 and 96.21

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Solution

The fourth proportional to 99.57, 138.03 and 96.21 is: 133.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.57 : 138.03 = 96.21 : x
  2. Step 2: Convert to fraction form
    99.57/138.03 = 96.21/x
  3. Step 3: Cross multiply
    99.57x = 138.03 × 96.21
  4. Step 4: Simplify right side
    99.57x = 13,279.87
  5. Step 5: Solve for x
    x = 13,279.87/99.57
  6. Step 6: Final answer
    x = 133.37

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.