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Finding the Fourth Proportional to 674.88, 1,012.32 and 386.88

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Solution

The fourth proportional to 674.88, 1,012.32 and 386.88 is: 580.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.88 : 1,012.32 = 386.88 : x
  2. Step 2: Convert to fraction form
    674.88/1,012.32 = 386.88/x
  3. Step 3: Cross multiply
    674.88x = 1,012.32 × 386.88
  4. Step 4: Simplify right side
    674.88x = 391,646.36
  5. Step 5: Solve for x
    x = 391,646.36/674.88
  6. Step 6: Final answer
    x = 580.32

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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.