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Finding the Fourth Proportional to 3,129.80, 4,691.10 and 1,279.70

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Solution

The fourth proportional to 3,129.80, 4,691.10 and 1,279.70 is: 1,918.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,129.80 : 4,691.10 = 1,279.70 : x
  2. Step 2: Convert to fraction form
    3,129.80/4,691.10 = 1,279.70/x
  3. Step 3: Cross multiply
    3,129.80x = 4,691.10 × 1,279.70
  4. Step 4: Simplify right side
    3,129.80x = 6,003,200.67
  5. Step 5: Solve for x
    x = 6,003,200.67/3,129.80
  6. Step 6: Final answer
    x = 1,918.08

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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.