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Finding the Fourth Proportional to 124.68, 171.84 and 100.08

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Solution

The fourth proportional to 124.68, 171.84 and 100.08 is: 137.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.68 : 171.84 = 100.08 : x
  2. Step 2: Convert to fraction form
    124.68/171.84 = 100.08/x
  3. Step 3: Cross multiply
    124.68x = 171.84 × 100.08
  4. Step 4: Simplify right side
    124.68x = 17,196.39
  5. Step 5: Solve for x
    x = 17,196.39/124.68
  6. Step 6: Final answer
    x = 137.92

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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.