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Finding the Fourth Proportional to 3,912.39, 5,868.59 and 990.69

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Solution

The fourth proportional to 3,912.39, 5,868.59 and 990.69 is: 1,486.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,912.39 : 5,868.59 = 990.69 : x
  2. Step 2: Convert to fraction form
    3,912.39/5,868.59 = 990.69/x
  3. Step 3: Cross multiply
    3,912.39x = 5,868.59 × 990.69
  4. Step 4: Simplify right side
    3,912.39x = 5,813,948.47
  5. Step 5: Solve for x
    x = 5,813,948.47/3,912.39
  6. Step 6: Final answer
    x = 1,486.04

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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.