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Finding the Fourth Proportional to 83.88, 115.61 and 77.69

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Solution

The fourth proportional to 83.88, 115.61 and 77.69 is: 107.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.88 : 115.61 = 77.69 : x
  2. Step 2: Convert to fraction form
    83.88/115.61 = 77.69/x
  3. Step 3: Cross multiply
    83.88x = 115.61 × 77.69
  4. Step 4: Simplify right side
    83.88x = 8,980.77
  5. Step 5: Solve for x
    x = 8,980.77/83.88
  6. Step 6: Final answer
    x = 107.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.