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Finding the Fourth Proportional to 738.59, 1,108.08 and 413.78

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Solution

The fourth proportional to 738.59, 1,108.08 and 413.78 is: 620.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.59 : 1,108.08 = 413.78 : x
  2. Step 2: Convert to fraction form
    738.59/1,108.08 = 413.78/x
  3. Step 3: Cross multiply
    738.59x = 1,108.08 × 413.78
  4. Step 4: Simplify right side
    738.59x = 458,495.80
  5. Step 5: Solve for x
    x = 458,495.80/738.59
  6. Step 6: Final answer
    x = 620.78

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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.