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Finding the Fourth Proportional to 124.89, 172.41 and 81.30

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Solution

The fourth proportional to 124.89, 172.41 and 81.30 is: 112.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.89 : 172.41 = 81.30 : x
  2. Step 2: Convert to fraction form
    124.89/172.41 = 81.30/x
  3. Step 3: Cross multiply
    124.89x = 172.41 × 81.30
  4. Step 4: Simplify right side
    124.89x = 14,016.93
  5. Step 5: Solve for x
    x = 14,016.93/124.89
  6. Step 6: Final answer
    x = 112.23

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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.