Home / 3,921.40-5,882.25-999.78

Finding the Fourth Proportional to 3,921.40, 5,882.25 and 999.78

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Solution

The fourth proportional to 3,921.40, 5,882.25 and 999.78 is: 1,499.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921.40 : 5,882.25 = 999.78 : x
  2. Step 2: Convert to fraction form
    3,921.40/5,882.25 = 999.78/x
  3. Step 3: Cross multiply
    3,921.40x = 5,882.25 × 999.78
  4. Step 4: Simplify right side
    3,921.40x = 5,880,937.60
  5. Step 5: Solve for x
    x = 5,880,937.60/3,921.40
  6. Step 6: Final answer
    x = 1,499.71

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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.