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Finding the Fourth Proportional to 83.94, 125.79 and 78.18

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Solution

The fourth proportional to 83.94, 125.79 and 78.18 is: 117.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.94 : 125.79 = 78.18 : x
  2. Step 2: Convert to fraction form
    83.94/125.79 = 78.18/x
  3. Step 3: Cross multiply
    83.94x = 125.79 × 78.18
  4. Step 4: Simplify right side
    83.94x = 9,833.63
  5. Step 5: Solve for x
    x = 9,833.63/83.94
  6. Step 6: Final answer
    x = 117.16

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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.