Home / 2,489.20-3,434.46-1,440.64

Finding the Fourth Proportional to 2,489.20, 3,434.46 and 1,440.64

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Solution

The fourth proportional to 2,489.20, 3,434.46 and 1,440.64 is: 1,987.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,489.20 : 3,434.46 = 1,440.64 : x
  2. Step 2: Convert to fraction form
    2,489.20/3,434.46 = 1,440.64/x
  3. Step 3: Cross multiply
    2,489.20x = 3,434.46 × 1,440.64
  4. Step 4: Simplify right side
    2,489.20x = 4,947,820.45
  5. Step 5: Solve for x
    x = 4,947,820.45/2,489.20
  6. Step 6: Final answer
    x = 1,987.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.