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Finding the Fourth Proportional to 99.40, 137.18 and 76.12

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Solution

The fourth proportional to 99.40, 137.18 and 76.12 is: 105.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.40 : 137.18 = 76.12 : x
  2. Step 2: Convert to fraction form
    99.40/137.18 = 76.12/x
  3. Step 3: Cross multiply
    99.40x = 137.18 × 76.12
  4. Step 4: Simplify right side
    99.40x = 10,442.14
  5. Step 5: Solve for x
    x = 10,442.14/99.40
  6. Step 6: Final answer
    x = 105.05

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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.