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Finding the Fourth Proportional to 99.67, 137.46 and 76.32

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Solution

The fourth proportional to 99.67, 137.46 and 76.32 is: 105.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.67 : 137.46 = 76.32 : x
  2. Step 2: Convert to fraction form
    99.67/137.46 = 76.32/x
  3. Step 3: Cross multiply
    99.67x = 137.46 × 76.32
  4. Step 4: Simplify right side
    99.67x = 10,490.07
  5. Step 5: Solve for x
    x = 10,490.07/99.67
  6. Step 6: Final answer
    x = 105.25

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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.