Home / 3,139.90-4,712.55-1,387.60

Finding the Fourth Proportional to 3,139.90, 4,712.55 and 1,387.60

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Solution

The fourth proportional to 3,139.90, 4,712.55 and 1,387.60 is: 2,082.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.90 : 4,712.55 = 1,387.60 : x
  2. Step 2: Convert to fraction form
    3,139.90/4,712.55 = 1,387.60/x
  3. Step 3: Cross multiply
    3,139.90x = 4,712.55 × 1,387.60
  4. Step 4: Simplify right side
    3,139.90x = 6,539,134.38
  5. Step 5: Solve for x
    x = 6,539,134.38/3,139.90
  6. Step 6: Final answer
    x = 2,082.59

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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.