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Finding the Fourth Proportional to 125.12, 187.40 and 105.92

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Solution

The fourth proportional to 125.12, 187.40 and 105.92 is: 158.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.12 : 187.40 = 105.92 : x
  2. Step 2: Convert to fraction form
    125.12/187.40 = 105.92/x
  3. Step 3: Cross multiply
    125.12x = 187.40 × 105.92
  4. Step 4: Simplify right side
    125.12x = 19,849.41
  5. Step 5: Solve for x
    x = 19,849.41/125.12
  6. Step 6: Final answer
    x = 158.64

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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.