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Finding the Fourth Proportional to 99.77, 137.39 and 88.73

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Solution

The fourth proportional to 99.77, 137.39 and 88.73 is: 122.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.77 : 137.39 = 88.73 : x
  2. Step 2: Convert to fraction form
    99.77/137.39 = 88.73/x
  3. Step 3: Cross multiply
    99.77x = 137.39 × 88.73
  4. Step 4: Simplify right side
    99.77x = 12,189.48
  5. Step 5: Solve for x
    x = 12,189.48/99.77
  6. Step 6: Final answer
    x = 122.18

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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.