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Finding the Fourth Proportional to 674.40, 1,010.36 and 413.76

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Solution

The fourth proportional to 674.40, 1,010.36 and 413.76 is: 619.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.40 : 1,010.36 = 413.76 : x
  2. Step 2: Convert to fraction form
    674.40/1,010.36 = 413.76/x
  3. Step 3: Cross multiply
    674.40x = 1,010.36 × 413.76
  4. Step 4: Simplify right side
    674.40x = 418,046.55
  5. Step 5: Solve for x
    x = 418,046.55/674.40
  6. Step 6: Final answer
    x = 619.88

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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.