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Finding the Fourth Proportional to 125.10, 172.23 and 108.71

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Solution

The fourth proportional to 125.10, 172.23 and 108.71 is: 149.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.10 : 172.23 = 108.71 : x
  2. Step 2: Convert to fraction form
    125.10/172.23 = 108.71/x
  3. Step 3: Cross multiply
    125.10x = 172.23 × 108.71
  4. Step 4: Simplify right side
    125.10x = 18,722.26
  5. Step 5: Solve for x
    x = 18,722.26/125.10
  6. Step 6: Final answer
    x = 149.66

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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.