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Finding the Fourth Proportional to 124.89, 172.34 and 77.61

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Solution

The fourth proportional to 124.89, 172.34 and 77.61 is: 107.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.89 : 172.34 = 77.61 : x
  2. Step 2: Convert to fraction form
    124.89/172.34 = 77.61/x
  3. Step 3: Cross multiply
    124.89x = 172.34 × 77.61
  4. Step 4: Simplify right side
    124.89x = 13,375.11
  5. Step 5: Solve for x
    x = 13,375.11/124.89
  6. Step 6: Final answer
    x = 107.09

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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.