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Finding the Fourth Proportional to 124.89, 172.36 and 78.27

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Solution

The fourth proportional to 124.89, 172.36 and 78.27 is: 108.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.89 : 172.36 = 78.27 : x
  2. Step 2: Convert to fraction form
    124.89/172.36 = 78.27/x
  3. Step 3: Cross multiply
    124.89x = 172.36 × 78.27
  4. Step 4: Simplify right side
    124.89x = 13,490.62
  5. Step 5: Solve for x
    x = 13,490.62/124.89
  6. Step 6: Final answer
    x = 108.02

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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.