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Finding the Fourth Proportional to 99.15, 136.78 and 62.33

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Solution

The fourth proportional to 99.15, 136.78 and 62.33 is: 85.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.15 : 136.78 = 62.33 : x
  2. Step 2: Convert to fraction form
    99.15/136.78 = 62.33/x
  3. Step 3: Cross multiply
    99.15x = 136.78 × 62.33
  4. Step 4: Simplify right side
    99.15x = 8,524.81
  5. Step 5: Solve for x
    x = 8,524.81/99.15
  6. Step 6: Final answer
    x = 85.98

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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.