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Finding the Fourth Proportional to 674.78, 1,012.17 and 386.02

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Solution

The fourth proportional to 674.78, 1,012.17 and 386.02 is: 579.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.78 : 1,012.17 = 386.02 : x
  2. Step 2: Convert to fraction form
    674.78/1,012.17 = 386.02/x
  3. Step 3: Cross multiply
    674.78x = 1,012.17 × 386.02
  4. Step 4: Simplify right side
    674.78x = 390,713.80
  5. Step 5: Solve for x
    x = 390,713.80/674.78
  6. Step 6: Final answer
    x = 579.02

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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.