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Finding the Fourth Proportional to 99.15, 136.80 and 55.47

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Solution

The fourth proportional to 99.15, 136.80 and 55.47 is: 76.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.15 : 136.80 = 55.47 : x
  2. Step 2: Convert to fraction form
    99.15/136.80 = 55.47/x
  3. Step 3: Cross multiply
    99.15x = 136.80 × 55.47
  4. Step 4: Simplify right side
    99.15x = 7,588.30
  5. Step 5: Solve for x
    x = 7,588.30/99.15
  6. Step 6: Final answer
    x = 76.53

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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.