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Finding the Fourth Proportional to 125.15, 172.67 and 83.70

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Solution

The fourth proportional to 125.15, 172.67 and 83.70 is: 115.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.15 : 172.67 = 83.70 : x
  2. Step 2: Convert to fraction form
    125.15/172.67 = 83.70/x
  3. Step 3: Cross multiply
    125.15x = 172.67 × 83.70
  4. Step 4: Simplify right side
    125.15x = 14,452.06
  5. Step 5: Solve for x
    x = 14,452.06/125.15
  6. Step 6: Final answer
    x = 115.48

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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.