Home / 2,589.12-3,880.72-1,287.68

Finding the Fourth Proportional to 2,589.12, 3,880.72 and 1,287.68

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Solution

The fourth proportional to 2,589.12, 3,880.72 and 1,287.68 is: 1,930.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,589.12 : 3,880.72 = 1,287.68 : x
  2. Step 2: Convert to fraction form
    2,589.12/3,880.72 = 1,287.68/x
  3. Step 3: Cross multiply
    2,589.12x = 3,880.72 × 1,287.68
  4. Step 4: Simplify right side
    2,589.12x = 4,997,125.53
  5. Step 5: Solve for x
    x = 4,997,125.53/2,589.12
  6. Step 6: Final answer
    x = 1,930.05

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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.