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Finding the Fourth Proportional to 8,961.16, 12,330.96 and 8,122.81

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Solution

The fourth proportional to 8,961.16, 12,330.96 and 8,122.81 is: 11,177.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,961.16 : 12,330.96 = 8,122.81 : x
  2. Step 2: Convert to fraction form
    8,961.16/12,330.96 = 8,122.81/x
  3. Step 3: Cross multiply
    8,961.16x = 12,330.96 × 8,122.81
  4. Step 4: Simplify right side
    8,961.16x = 100,162,045.20
  5. Step 5: Solve for x
    x = 100,162,045.20/8,961.16
  6. Step 6: Final answer
    x = 11,177.35

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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.