Home / 3,451.28-5,177.84-1,987.21

Finding the Fourth Proportional to 3,451.28, 5,177.84 and 1,987.21

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Solution

The fourth proportional to 3,451.28, 5,177.84 and 1,987.21 is: 2,981.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,451.28 : 5,177.84 = 1,987.21 : x
  2. Step 2: Convert to fraction form
    3,451.28/5,177.84 = 1,987.21/x
  3. Step 3: Cross multiply
    3,451.28x = 5,177.84 × 1,987.21
  4. Step 4: Simplify right side
    3,451.28x = 10,289,432.55
  5. Step 5: Solve for x
    x = 10,289,432.55/3,451.28
  6. Step 6: Final answer
    x = 2,981.34

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Double scale
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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.