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Finding the Fourth Proportional to 124.77, 171.62 and 100.16

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Solution

The fourth proportional to 124.77, 171.62 and 100.16 is: 137.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.77 : 171.62 = 100.16 : x
  2. Step 2: Convert to fraction form
    124.77/171.62 = 100.16/x
  3. Step 3: Cross multiply
    124.77x = 171.62 × 100.16
  4. Step 4: Simplify right side
    124.77x = 17,188.53
  5. Step 5: Solve for x
    x = 17,188.53/124.77
  6. Step 6: Final answer
    x = 137.76

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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.