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Finding the Fourth Proportional to 876.20, 1,314.30 and 413.90

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Solution

The fourth proportional to 876.20, 1,314.30 and 413.90 is: 620.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.20 : 1,314.30 = 413.90 : x
  2. Step 2: Convert to fraction form
    876.20/1,314.30 = 413.90/x
  3. Step 3: Cross multiply
    876.20x = 1,314.30 × 413.90
  4. Step 4: Simplify right side
    876.20x = 543,982.20
  5. Step 5: Solve for x
    x = 543,982.20/876.20
  6. Step 6: Final answer
    x = 620.85

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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.