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Finding the Fourth Proportional to 8,240.62, 12,349.98 and 7,139.86

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Solution

The fourth proportional to 8,240.62, 12,349.98 and 7,139.86 is: 10,700.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,240.62 : 12,349.98 = 7,139.86 : x
  2. Step 2: Convert to fraction form
    8,240.62/12,349.98 = 7,139.86/x
  3. Step 3: Cross multiply
    8,240.62x = 12,349.98 × 7,139.86
  4. Step 4: Simplify right side
    8,240.62x = 88,177,128.20
  5. Step 5: Solve for x
    x = 88,177,128.20/8,240.62
  6. Step 6: Final answer
    x = 10,700.30

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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.