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Finding the Fourth Proportional to 125.12, 188 and 82.72

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Solution

The fourth proportional to 125.12, 188 and 82.72 is: 124.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.12 : 188 = 82.72 : x
  2. Step 2: Convert to fraction form
    125.12/188 = 82.72/x
  3. Step 3: Cross multiply
    125.12x = 188 × 82.72
  4. Step 4: Simplify right side
    125.12x = 15,551.36
  5. Step 5: Solve for x
    x = 15,551.36/125.12
  6. Step 6: Final answer
    x = 124.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.