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Finding the Fourth Proportional to 125.81, 188.81 and 71.74

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Solution

The fourth proportional to 125.81, 188.81 and 71.74 is: 107.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.81 : 188.81 = 71.74 : x
  2. Step 2: Convert to fraction form
    125.81/188.81 = 71.74/x
  3. Step 3: Cross multiply
    125.81x = 188.81 × 71.74
  4. Step 4: Simplify right side
    125.81x = 13,545.23
  5. Step 5: Solve for x
    x = 13,545.23/125.81
  6. Step 6: Final answer
    x = 107.66

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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.