Home / 3,170.20-4,755.30-861.70

Finding the Fourth Proportional to 3,170.20, 4,755.30 and 861.70

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Solution

The fourth proportional to 3,170.20, 4,755.30 and 861.70 is: 1,292.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,170.20 : 4,755.30 = 861.70 : x
  2. Step 2: Convert to fraction form
    3,170.20/4,755.30 = 861.70/x
  3. Step 3: Cross multiply
    3,170.20x = 4,755.30 × 861.70
  4. Step 4: Simplify right side
    3,170.20x = 4,097,642.01
  5. Step 5: Solve for x
    x = 4,097,642.01/3,170.20
  6. Step 6: Final answer
    x = 1,292.55

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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.