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Finding the Fourth Proportional to 99.74, 137.64 and 55.48

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Solution

The fourth proportional to 99.74, 137.64 and 55.48 is: 76.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.74 : 137.64 = 55.48 : x
  2. Step 2: Convert to fraction form
    99.74/137.64 = 55.48/x
  3. Step 3: Cross multiply
    99.74x = 137.64 × 55.48
  4. Step 4: Simplify right side
    99.74x = 7,635.99
  5. Step 5: Solve for x
    x = 7,635.99/99.74
  6. Step 6: Final answer
    x = 76.56

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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.