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Finding the Fourth Proportional to 99.80, 138.43 and 94.92

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Solution

The fourth proportional to 99.80, 138.43 and 94.92 is: 131.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.80 : 138.43 = 94.92 : x
  2. Step 2: Convert to fraction form
    99.80/138.43 = 94.92/x
  3. Step 3: Cross multiply
    99.80x = 138.43 × 94.92
  4. Step 4: Simplify right side
    99.80x = 13,139.78
  5. Step 5: Solve for x
    x = 13,139.78/99.80
  6. Step 6: Final answer
    x = 131.66

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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.