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Finding the Fourth Proportional to 125.78, 188.49 and 77.66

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Solution

The fourth proportional to 125.78, 188.49 and 77.66 is: 116.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.78 : 188.49 = 77.66 : x
  2. Step 2: Convert to fraction form
    125.78/188.49 = 77.66/x
  3. Step 3: Cross multiply
    125.78x = 188.49 × 77.66
  4. Step 4: Simplify right side
    125.78x = 14,638.13
  5. Step 5: Solve for x
    x = 14,638.13/125.78
  6. Step 6: Final answer
    x = 116.38

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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.