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Finding the Fourth Proportional to 125.81, 173.57 and 82.13

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Solution

The fourth proportional to 125.81, 173.57 and 82.13 is: 113.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.81 : 173.57 = 82.13 : x
  2. Step 2: Convert to fraction form
    125.81/173.57 = 82.13/x
  3. Step 3: Cross multiply
    125.81x = 173.57 × 82.13
  4. Step 4: Simplify right side
    125.81x = 14,254.03
  5. Step 5: Solve for x
    x = 14,254.03/125.81
  6. Step 6: Final answer
    x = 113.30

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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.