Home / 2,639.28-3,642.18-1,520.21

Finding the Fourth Proportional to 2,639.28, 3,642.18 and 1,520.21

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Solution

The fourth proportional to 2,639.28, 3,642.18 and 1,520.21 is: 2,097.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.28 : 3,642.18 = 1,520.21 : x
  2. Step 2: Convert to fraction form
    2,639.28/3,642.18 = 1,520.21/x
  3. Step 3: Cross multiply
    2,639.28x = 3,642.18 × 1,520.21
  4. Step 4: Simplify right side
    2,639.28x = 5,536,860.25
  5. Step 5: Solve for x
    x = 5,536,860.25/2,639.28
  6. Step 6: Final answer
    x = 2,097.87

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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.