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Finding the Fourth Proportional to 83.17, 114.85 and 77.50

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Solution

The fourth proportional to 83.17, 114.85 and 77.50 is: 107.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.17 : 114.85 = 77.50 : x
  2. Step 2: Convert to fraction form
    83.17/114.85 = 77.50/x
  3. Step 3: Cross multiply
    83.17x = 114.85 × 77.50
  4. Step 4: Simplify right side
    83.17x = 8,900.88
  5. Step 5: Solve for x
    x = 8,900.88/83.17
  6. Step 6: Final answer
    x = 107.02

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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.