Home / 83,138.28-124,706.57-20,808.78

Finding the Fourth Proportional to 83,138.28, 124,706.57 and 20,808.78

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Solution

The fourth proportional to 83,138.28, 124,706.57 and 20,808.78 is: 31,212.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,138.28 : 124,706.57 = 20,808.78 : x
  2. Step 2: Convert to fraction form
    83,138.28/124,706.57 = 20,808.78/x
  3. Step 3: Cross multiply
    83,138.28x = 124,706.57 × 20,808.78
  4. Step 4: Simplify right side
    83,138.28x = 2,594,991,475.64
  5. Step 5: Solve for x
    x = 2,594,991,475.64/83,138.28
  6. Step 6: Final answer
    x = 31,212.96

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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.