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Finding the Fourth Proportional to 674.28, 1,012.28 and 520.31

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Solution

The fourth proportional to 674.28, 1,012.28 and 520.31 is: 781.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.28 : 1,012.28 = 520.31 : x
  2. Step 2: Convert to fraction form
    674.28/1,012.28 = 520.31/x
  3. Step 3: Cross multiply
    674.28x = 1,012.28 × 520.31
  4. Step 4: Simplify right side
    674.28x = 526,699.41
  5. Step 5: Solve for x
    x = 526,699.41/674.28
  6. Step 6: Final answer
    x = 781.13

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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.