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Finding the Fourth Proportional to 2,633.70, 3,951.18 and 990.21

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Solution

The fourth proportional to 2,633.70, 3,951.18 and 990.21 is: 1,485.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,633.70 : 3,951.18 = 990.21 : x
  2. Step 2: Convert to fraction form
    2,633.70/3,951.18 = 990.21/x
  3. Step 3: Cross multiply
    2,633.70x = 3,951.18 × 990.21
  4. Step 4: Simplify right side
    2,633.70x = 3,912,497.95
  5. Step 5: Solve for x
    x = 3,912,497.95/2,633.70
  6. Step 6: Final answer
    x = 1,485.55

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Double scale
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Similar ratio
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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.