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Finding the Fourth Proportional to 3,127.80, 4,691.70 and 819.30

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Solution

The fourth proportional to 3,127.80, 4,691.70 and 819.30 is: 1,228.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,127.80 : 4,691.70 = 819.30 : x
  2. Step 2: Convert to fraction form
    3,127.80/4,691.70 = 819.30/x
  3. Step 3: Cross multiply
    3,127.80x = 4,691.70 × 819.30
  4. Step 4: Simplify right side
    3,127.80x = 3,843,909.81
  5. Step 5: Solve for x
    x = 3,843,909.81/3,127.80
  6. Step 6: Final answer
    x = 1,228.95

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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.