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Finding the Fourth Proportional to 124.09, 170.66 and 99.49

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Solution

The fourth proportional to 124.09, 170.66 and 99.49 is: 136.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.09 : 170.66 = 99.49 : x
  2. Step 2: Convert to fraction form
    124.09/170.66 = 99.49/x
  3. Step 3: Cross multiply
    124.09x = 170.66 × 99.49
  4. Step 4: Simplify right side
    124.09x = 16,977.61
  5. Step 5: Solve for x
    x = 16,977.61/124.09
  6. Step 6: Final answer
    x = 136.82

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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.