Home / 2,139.20-3,193.34-1,978.88

Finding the Fourth Proportional to 2,139.20, 3,193.34 and 1,978.88

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Solution

The fourth proportional to 2,139.20, 3,193.34 and 1,978.88 is: 2,954.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.20 : 3,193.34 = 1,978.88 : x
  2. Step 2: Convert to fraction form
    2,139.20/3,193.34 = 1,978.88/x
  3. Step 3: Cross multiply
    2,139.20x = 3,193.34 × 1,978.88
  4. Step 4: Simplify right side
    2,139.20x = 6,319,236.66
  5. Step 5: Solve for x
    x = 6,319,236.66/2,139.20
  6. Step 6: Final answer
    x = 2,954.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.