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Finding the Fourth Proportional to 8,785.20, 12,101.52 and 7,899.60

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Solution

The fourth proportional to 8,785.20, 12,101.52 and 7,899.60 is: 10,881.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,785.20 : 12,101.52 = 7,899.60 : x
  2. Step 2: Convert to fraction form
    8,785.20/12,101.52 = 7,899.60/x
  3. Step 3: Cross multiply
    8,785.20x = 12,101.52 × 7,899.60
  4. Step 4: Simplify right side
    8,785.20x = 95,597,167.39
  5. Step 5: Solve for x
    x = 95,597,167.39/8,785.20
  6. Step 6: Final answer
    x = 10,881.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.