Home / 8,439.72-12,663.88-5,115.92

Finding the Fourth Proportional to 8,439.72, 12,663.88 and 5,115.92

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Solution

The fourth proportional to 8,439.72, 12,663.88 and 5,115.92 is: 7,676.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,439.72 : 12,663.88 = 5,115.92 : x
  2. Step 2: Convert to fraction form
    8,439.72/12,663.88 = 5,115.92/x
  3. Step 3: Cross multiply
    8,439.72x = 12,663.88 × 5,115.92
  4. Step 4: Simplify right side
    8,439.72x = 64,787,396.97
  5. Step 5: Solve for x
    x = 64,787,396.97/8,439.72
  6. Step 6: Final answer
    x = 7,676.49

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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.