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Finding the Fourth Proportional to 99.10, 136.78 and 55.45

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Solution

The fourth proportional to 99.10, 136.78 and 55.45 is: 76.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.10 : 136.78 = 55.45 : x
  2. Step 2: Convert to fraction form
    99.10/136.78 = 55.45/x
  3. Step 3: Cross multiply
    99.10x = 136.78 × 55.45
  4. Step 4: Simplify right side
    99.10x = 7,584.48
  5. Step 5: Solve for x
    x = 7,584.48/99.10
  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.