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Finding the Fourth Proportional to 124.42, 171.72 and 74.64

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Solution

The fourth proportional to 124.42, 171.72 and 74.64 is: 103.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.42 : 171.72 = 74.64 : x
  2. Step 2: Convert to fraction form
    124.42/171.72 = 74.64/x
  3. Step 3: Cross multiply
    124.42x = 171.72 × 74.64
  4. Step 4: Simplify right side
    124.42x = 12,817.18
  5. Step 5: Solve for x
    x = 12,817.18/124.42
  6. Step 6: Final answer
    x = 103.02

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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.