Home / 8,639.28-12,958.16-5,261.20

Finding the Fourth Proportional to 8,639.28, 12,958.16 and 5,261.20

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Solution

The fourth proportional to 8,639.28, 12,958.16 and 5,261.20 is: 7,891.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,639.28 : 12,958.16 = 5,261.20 : x
  2. Step 2: Convert to fraction form
    8,639.28/12,958.16 = 5,261.20/x
  3. Step 3: Cross multiply
    8,639.28x = 12,958.16 × 5,261.20
  4. Step 4: Simplify right side
    8,639.28x = 68,175,471.39
  5. Step 5: Solve for x
    x = 68,175,471.39/8,639.28
  6. Step 6: Final answer
    x = 7,891.34

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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.