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Finding the Fourth Proportional to 112.61, 169.58 and 99.89

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Solution

The fourth proportional to 112.61, 169.58 and 99.89 is: 150.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.61 : 169.58 = 99.89 : x
  2. Step 2: Convert to fraction form
    112.61/169.58 = 99.89/x
  3. Step 3: Cross multiply
    112.61x = 169.58 × 99.89
  4. Step 4: Simplify right side
    112.61x = 16,938.00
  5. Step 5: Solve for x
    x = 16,938.00/112.61
  6. Step 6: Final answer
    x = 150.42

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.