Home / 8,139.20-12,234.90-7,561.40

Finding the Fourth Proportional to 8,139.20, 12,234.90 and 7,561.40

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Solution

The fourth proportional to 8,139.20, 12,234.90 and 7,561.40 is: 11,366.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,139.20 : 12,234.90 = 7,561.40 : x
  2. Step 2: Convert to fraction form
    8,139.20/12,234.90 = 7,561.40/x
  3. Step 3: Cross multiply
    8,139.20x = 12,234.90 × 7,561.40
  4. Step 4: Simplify right side
    8,139.20x = 92,512,972.86
  5. Step 5: Solve for x
    x = 92,512,972.86/8,139.20
  6. Step 6: Final answer
    x = 11,366.35

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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.