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Finding the Fourth Proportional to 125.83, 188.78 and 61.66

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Solution

The fourth proportional to 125.83, 188.78 and 61.66 is: 92.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.83 : 188.78 = 61.66 : x
  2. Step 2: Convert to fraction form
    125.83/188.78 = 61.66/x
  3. Step 3: Cross multiply
    125.83x = 188.78 × 61.66
  4. Step 4: Simplify right side
    125.83x = 11,640.17
  5. Step 5: Solve for x
    x = 11,640.17/125.83
  6. Step 6: Final answer
    x = 92.51

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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.