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Finding the Fourth Proportional to 83.84, 126.21 and 56.95

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Solution

The fourth proportional to 83.84, 126.21 and 56.95 is: 85.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.84 : 126.21 = 56.95 : x
  2. Step 2: Convert to fraction form
    83.84/126.21 = 56.95/x
  3. Step 3: Cross multiply
    83.84x = 126.21 × 56.95
  4. Step 4: Simplify right side
    83.84x = 7,187.95
  5. Step 5: Solve for x
    x = 7,187.95/83.84
  6. Step 6: Final answer
    x = 85.74

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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.