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Finding the Fourth Proportional to 124.80, 172.20 and 108.48

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Solution

The fourth proportional to 124.80, 172.20 and 108.48 is: 149.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.80 : 172.20 = 108.48 : x
  2. Step 2: Convert to fraction form
    124.80/172.20 = 108.48/x
  3. Step 3: Cross multiply
    124.80x = 172.20 × 108.48
  4. Step 4: Simplify right side
    124.80x = 18,680.26
  5. Step 5: Solve for x
    x = 18,680.26/124.80
  6. Step 6: Final answer
    x = 149.68

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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.