Home / 8,987.20-12,398.88-5,449.12

Finding the Fourth Proportional to 8,987.20, 12,398.88 and 5,449.12

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Solution

The fourth proportional to 8,987.20, 12,398.88 and 5,449.12 is: 7,517.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,987.20 : 12,398.88 = 5,449.12 : x
  2. Step 2: Convert to fraction form
    8,987.20/12,398.88 = 5,449.12/x
  3. Step 3: Cross multiply
    8,987.20x = 12,398.88 × 5,449.12
  4. Step 4: Simplify right side
    8,987.20x = 67,562,984.99
  5. Step 5: Solve for x
    x = 67,562,984.99/8,987.20
  6. Step 6: Final answer
    x = 7,517.69

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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.