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Finding the Fourth Proportional to 8,861.20, 13,187.20 and 8,565.92

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Solution

The fourth proportional to 8,861.20, 13,187.20 and 8,565.92 is: 12,747.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,861.20 : 13,187.20 = 8,565.92 : x
  2. Step 2: Convert to fraction form
    8,861.20/13,187.20 = 8,565.92/x
  3. Step 3: Cross multiply
    8,861.20x = 13,187.20 × 8,565.92
  4. Step 4: Simplify right side
    8,861.20x = 112,960,500.22
  5. Step 5: Solve for x
    x = 112,960,500.22/8,861.20
  6. Step 6: Final answer
    x = 12,747.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.