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Finding the Fourth Proportional to 124.54, 171.88 and 103.79

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Solution

The fourth proportional to 124.54, 171.88 and 103.79 is: 143.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.54 : 171.88 = 103.79 : x
  2. Step 2: Convert to fraction form
    124.54/171.88 = 103.79/x
  3. Step 3: Cross multiply
    124.54x = 171.88 × 103.79
  4. Step 4: Simplify right side
    124.54x = 17,839.68
  5. Step 5: Solve for x
    x = 17,839.68/124.54
  6. Step 6: Final answer
    x = 143.25

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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.