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Finding the Fourth Proportional to 83.79, 115.64 and 69.95

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Solution

The fourth proportional to 83.79, 115.64 and 69.95 is: 96.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.79 : 115.64 = 69.95 : x
  2. Step 2: Convert to fraction form
    83.79/115.64 = 69.95/x
  3. Step 3: Cross multiply
    83.79x = 115.64 × 69.95
  4. Step 4: Simplify right side
    83.79x = 8,089.02
  5. Step 5: Solve for x
    x = 8,089.02/83.79
  6. Step 6: Final answer
    x = 96.54

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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.