Home / 3,431.28-5,147.28-1,122.78

Finding the Fourth Proportional to 3,431.28, 5,147.28 and 1,122.78

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Solution

The fourth proportional to 3,431.28, 5,147.28 and 1,122.78 is: 1,684.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,431.28 : 5,147.28 = 1,122.78 : x
  2. Step 2: Convert to fraction form
    3,431.28/5,147.28 = 1,122.78/x
  3. Step 3: Cross multiply
    3,431.28x = 5,147.28 × 1,122.78
  4. Step 4: Simplify right side
    3,431.28x = 5,779,263.04
  5. Step 5: Solve for x
    x = 5,779,263.04/3,431.28
  6. Step 6: Final answer
    x = 1,684.29

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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.