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Finding the Fourth Proportional to 124.69, 171.28 and 101.28

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Solution

The fourth proportional to 124.69, 171.28 and 101.28 is: 139.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.69 : 171.28 = 101.28 : x
  2. Step 2: Convert to fraction form
    124.69/171.28 = 101.28/x
  3. Step 3: Cross multiply
    124.69x = 171.28 × 101.28
  4. Step 4: Simplify right side
    124.69x = 17,345.88
  5. Step 5: Solve for x
    x = 17,345.88/124.69
  6. Step 6: Final answer
    x = 139.11

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.