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Finding the Fourth Proportional to 674.69, 1,012.03 and 385.92

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Solution

The fourth proportional to 674.69, 1,012.03 and 385.92 is: 578.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.69 : 1,012.03 = 385.92 : x
  2. Step 2: Convert to fraction form
    674.69/1,012.03 = 385.92/x
  3. Step 3: Cross multiply
    674.69x = 1,012.03 × 385.92
  4. Step 4: Simplify right side
    674.69x = 390,566.90
  5. Step 5: Solve for x
    x = 390,566.90/674.69
  6. Step 6: Final answer
    x = 578.88

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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.