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Finding the Fourth Proportional to 83.18, 124.68 and 54.35

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Solution

The fourth proportional to 83.18, 124.68 and 54.35 is: 81.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.18 : 124.68 = 54.35 : x
  2. Step 2: Convert to fraction form
    83.18/124.68 = 54.35/x
  3. Step 3: Cross multiply
    83.18x = 124.68 × 54.35
  4. Step 4: Simplify right side
    83.18x = 6,776.00
  5. Step 5: Solve for x
    x = 6,776.00/83.18
  6. Step 6: Final answer
    x = 81.46

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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.