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Finding the Fourth Proportional to 3,211.50, 4,817.25 and 779.50

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Solution

The fourth proportional to 3,211.50, 4,817.25 and 779.50 is: 1,169.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,211.50 : 4,817.25 = 779.50 : x
  2. Step 2: Convert to fraction form
    3,211.50/4,817.25 = 779.50/x
  3. Step 3: Cross multiply
    3,211.50x = 4,817.25 × 779.50
  4. Step 4: Simplify right side
    3,211.50x = 3,755,046.38
  5. Step 5: Solve for x
    x = 3,755,046.38/3,211.50
  6. Step 6: Final answer
    x = 1,169.25

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1.5x scale

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.