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Finding the Fourth Proportional to 124.66, 171.93 and 102.79

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Solution

The fourth proportional to 124.66, 171.93 and 102.79 is: 141.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.66 : 171.93 = 102.79 : x
  2. Step 2: Convert to fraction form
    124.66/171.93 = 102.79/x
  3. Step 3: Cross multiply
    124.66x = 171.93 × 102.79
  4. Step 4: Simplify right side
    124.66x = 17,672.68
  5. Step 5: Solve for x
    x = 17,672.68/124.66
  6. Step 6: Final answer
    x = 141.77

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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.