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Finding the Fourth Proportional to 124.56, 171.89 and 69.28

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Solution

The fourth proportional to 124.56, 171.89 and 69.28 is: 95.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.56 : 171.89 = 69.28 : x
  2. Step 2: Convert to fraction form
    124.56/171.89 = 69.28/x
  3. Step 3: Cross multiply
    124.56x = 171.89 × 69.28
  4. Step 4: Simplify right side
    124.56x = 11,908.19
  5. Step 5: Solve for x
    x = 11,908.19/124.56
  6. Step 6: Final answer
    x = 95.60

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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.