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Finding the Fourth Proportional to 83.80, 124.54 and 77.32

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Solution

The fourth proportional to 83.80, 124.54 and 77.32 is: 114.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.80 : 124.54 = 77.32 : x
  2. Step 2: Convert to fraction form
    83.80/124.54 = 77.32/x
  3. Step 3: Cross multiply
    83.80x = 124.54 × 77.32
  4. Step 4: Simplify right side
    83.80x = 9,628.81
  5. Step 5: Solve for x
    x = 9,628.81/83.80
  6. Step 6: Final answer
    x = 114.91

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.