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Finding the Fourth Proportional to 99.40, 137.18 and 55.74

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Solution

The fourth proportional to 99.40, 137.18 and 55.74 is: 76.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.40 : 137.18 = 55.74 : x
  2. Step 2: Convert to fraction form
    99.40/137.18 = 55.74/x
  3. Step 3: Cross multiply
    99.40x = 137.18 × 55.74
  4. Step 4: Simplify right side
    99.40x = 7,645.87
  5. Step 5: Solve for x
    x = 7,645.87/99.40
  6. Step 6: Final answer
    x = 76.92

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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.