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Finding the Fourth Proportional to 3,170.32, 4,755.48 and 861.76

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Solution

The fourth proportional to 3,170.32, 4,755.48 and 861.76 is: 1,292.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,170.32 : 4,755.48 = 861.76 : x
  2. Step 2: Convert to fraction form
    3,170.32/4,755.48 = 861.76/x
  3. Step 3: Cross multiply
    3,170.32x = 4,755.48 × 861.76
  4. Step 4: Simplify right side
    3,170.32x = 4,098,082.44
  5. Step 5: Solve for x
    x = 4,098,082.44/3,170.32
  6. Step 6: Final answer
    x = 1,292.64

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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.