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Finding the Fourth Proportional to 99.82, 137.85 and 91.63

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Solution

The fourth proportional to 99.82, 137.85 and 91.63 is: 126.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.82 : 137.85 = 91.63 : x
  2. Step 2: Convert to fraction form
    99.82/137.85 = 91.63/x
  3. Step 3: Cross multiply
    99.82x = 137.85 × 91.63
  4. Step 4: Simplify right side
    99.82x = 12,631.20
  5. Step 5: Solve for x
    x = 12,631.20/99.82
  6. Step 6: Final answer
    x = 126.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.