Home / 5,431.28-8,147.55-1,920.55

Finding the Fourth Proportional to 5,431.28, 8,147.55 and 1,920.55

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Solution

The fourth proportional to 5,431.28, 8,147.55 and 1,920.55 is: 2,881.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,431.28 : 8,147.55 = 1,920.55 : x
  2. Step 2: Convert to fraction form
    5,431.28/8,147.55 = 1,920.55/x
  3. Step 3: Cross multiply
    5,431.28x = 8,147.55 × 1,920.55
  4. Step 4: Simplify right side
    5,431.28x = 15,647,779.26
  5. Step 5: Solve for x
    x = 15,647,779.26/5,431.28
  6. Step 6: Final answer
    x = 2,881.05

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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.