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Finding the Fourth Proportional to 99.96, 138 and 76.60

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Solution

The fourth proportional to 99.96, 138 and 76.60 is: 105.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.96 : 138 = 76.60 : x
  2. Step 2: Convert to fraction form
    99.96/138 = 76.60/x
  3. Step 3: Cross multiply
    99.96x = 138 × 76.60
  4. Step 4: Simplify right side
    99.96x = 10,570.80
  5. Step 5: Solve for x
    x = 10,570.80/99.96
  6. Step 6: Final answer
    x = 105.75

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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.