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Finding the Fourth Proportional to 124.78, 172.24 and 85.49

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Solution

The fourth proportional to 124.78, 172.24 and 85.49 is: 118.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.78 : 172.24 = 85.49 : x
  2. Step 2: Convert to fraction form
    124.78/172.24 = 85.49/x
  3. Step 3: Cross multiply
    124.78x = 172.24 × 85.49
  4. Step 4: Simplify right side
    124.78x = 14,724.80
  5. Step 5: Solve for x
    x = 14,724.80/124.78
  6. Step 6: Final answer
    x = 118.01

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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.