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Finding the Fourth Proportional to 99.81, 137.63 and 84.24

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Solution

The fourth proportional to 99.81, 137.63 and 84.24 is: 116.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.81 : 137.63 = 84.24 : x
  2. Step 2: Convert to fraction form
    99.81/137.63 = 84.24/x
  3. Step 3: Cross multiply
    99.81x = 137.63 × 84.24
  4. Step 4: Simplify right side
    99.81x = 11,593.53
  5. Step 5: Solve for x
    x = 11,593.53/99.81
  6. Step 6: Final answer
    x = 116.16

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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.