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Finding the Fourth Proportional to 99.94, 137.92 and 63.12

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Solution

The fourth proportional to 99.94, 137.92 and 63.12 is: 87.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.94 : 137.92 = 63.12 : x
  2. Step 2: Convert to fraction form
    99.94/137.92 = 63.12/x
  3. Step 3: Cross multiply
    99.94x = 137.92 × 63.12
  4. Step 4: Simplify right side
    99.94x = 8,705.51
  5. Step 5: Solve for x
    x = 8,705.51/99.94
  6. Step 6: Final answer
    x = 87.11

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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.