Home / 10,872.12-15,002.48-8,639.40

Finding the Fourth Proportional to 10,872.12, 15,002.48 and 8,639.40

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Solution

The fourth proportional to 10,872.12, 15,002.48 and 8,639.40 is: 11,921.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,872.12 : 15,002.48 = 8,639.40 : x
  2. Step 2: Convert to fraction form
    10,872.12/15,002.48 = 8,639.40/x
  3. Step 3: Cross multiply
    10,872.12x = 15,002.48 × 8,639.40
  4. Step 4: Simplify right side
    10,872.12x = 129,612,425.71
  5. Step 5: Solve for x
    x = 129,612,425.71/10,872.12
  6. Step 6: Final answer
    x = 11,921.54

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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.