Home / 8,517.28-12,766.88-4,128.72

Finding the Fourth Proportional to 8,517.28, 12,766.88 and 4,128.72

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Solution

The fourth proportional to 8,517.28, 12,766.88 and 4,128.72 is: 6,188.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,517.28 : 12,766.88 = 4,128.72 : x
  2. Step 2: Convert to fraction form
    8,517.28/12,766.88 = 4,128.72/x
  3. Step 3: Cross multiply
    8,517.28x = 12,766.88 × 4,128.72
  4. Step 4: Simplify right side
    8,517.28x = 52,710,872.79
  5. Step 5: Solve for x
    x = 52,710,872.79/8,517.28
  6. Step 6: Final answer
    x = 6,188.70

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1.5x scale

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.