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Finding the Fourth Proportional to 83.84, 126.46 and 78.77

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Solution

The fourth proportional to 83.84, 126.46 and 78.77 is: 118.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.84 : 126.46 = 78.77 : x
  2. Step 2: Convert to fraction form
    83.84/126.46 = 78.77/x
  3. Step 3: Cross multiply
    83.84x = 126.46 × 78.77
  4. Step 4: Simplify right side
    83.84x = 9,961.67
  5. Step 5: Solve for x
    x = 9,961.67/83.84
  6. Step 6: Final answer
    x = 118.82

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.