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Finding the Fourth Proportional to 125.32, 187.91 and 56.81

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Solution

The fourth proportional to 125.32, 187.91 and 56.81 is: 85.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.32 : 187.91 = 56.81 : x
  2. Step 2: Convert to fraction form
    125.32/187.91 = 56.81/x
  3. Step 3: Cross multiply
    125.32x = 187.91 × 56.81
  4. Step 4: Simplify right side
    125.32x = 10,675.17
  5. Step 5: Solve for x
    x = 10,675.17/125.32
  6. Step 6: Final answer
    x = 85.18

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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.