Home / 2,639.66-3,642.86-1,520.78

Finding the Fourth Proportional to 2,639.66, 3,642.86 and 1,520.78

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Solution

The fourth proportional to 2,639.66, 3,642.86 and 1,520.78 is: 2,098.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.66 : 3,642.86 = 1,520.78 : x
  2. Step 2: Convert to fraction form
    2,639.66/3,642.86 = 1,520.78/x
  3. Step 3: Cross multiply
    2,639.66x = 3,642.86 × 1,520.78
  4. Step 4: Simplify right side
    2,639.66x = 5,539,962.81
  5. Step 5: Solve for x
    x = 5,539,962.81/2,639.66
  6. Step 6: Final answer
    x = 2,098.75

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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.