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Finding the Fourth Proportional to 674.28, 1,011.96 and 613.80

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Solution

The fourth proportional to 674.28, 1,011.96 and 613.80 is: 921.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.28 : 1,011.96 = 613.80 : x
  2. Step 2: Convert to fraction form
    674.28/1,011.96 = 613.80/x
  3. Step 3: Cross multiply
    674.28x = 1,011.96 × 613.80
  4. Step 4: Simplify right side
    674.28x = 621,141.05
  5. Step 5: Solve for x
    x = 621,141.05/674.28
  6. Step 6: Final answer
    x = 921.19

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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.