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Finding the Fourth Proportional to 819.13, 1,228.70 and 674.55

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Solution

The fourth proportional to 819.13, 1,228.70 and 674.55 is: 1,011.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.13 : 1,228.70 = 674.55 : x
  2. Step 2: Convert to fraction form
    819.13/1,228.70 = 674.55/x
  3. Step 3: Cross multiply
    819.13x = 1,228.70 × 674.55
  4. Step 4: Simplify right side
    819.13x = 828,810.07
  5. Step 5: Solve for x
    x = 828,810.07/819.13
  6. Step 6: Final answer
    x = 1,011.82

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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.