Home / 20,517.17-30,780.54-6,478.61

Finding the Fourth Proportional to 20,517.17, 30,780.54 and 6,478.61

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Solution

The fourth proportional to 20,517.17, 30,780.54 and 6,478.61 is: 9,719.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,517.17 : 30,780.54 = 6,478.61 : x
  2. Step 2: Convert to fraction form
    20,517.17/30,780.54 = 6,478.61/x
  3. Step 3: Cross multiply
    20,517.17x = 30,780.54 × 6,478.61
  4. Step 4: Simplify right side
    20,517.17x = 199,414,960.35
  5. Step 5: Solve for x
    x = 199,414,960.35/20,517.17
  6. Step 6: Final answer
    x = 9,719.42

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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.