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Finding the Fourth Proportional to 99.75, 137.55 and 68.61

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Solution

The fourth proportional to 99.75, 137.55 and 68.61 is: 94.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.75 : 137.55 = 68.61 : x
  2. Step 2: Convert to fraction form
    99.75/137.55 = 68.61/x
  3. Step 3: Cross multiply
    99.75x = 137.55 × 68.61
  4. Step 4: Simplify right side
    99.75x = 9,437.31
  5. Step 5: Solve for x
    x = 9,437.31/99.75
  6. Step 6: Final answer
    x = 94.61

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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.