Home / 8,979.28-12,390.96-5,000.80

Finding the Fourth Proportional to 8,979.28, 12,390.96 and 5,000.80

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Solution

The fourth proportional to 8,979.28, 12,390.96 and 5,000.80 is: 6,900.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,979.28 : 12,390.96 = 5,000.80 : x
  2. Step 2: Convert to fraction form
    8,979.28/12,390.96 = 5,000.80/x
  3. Step 3: Cross multiply
    8,979.28x = 12,390.96 × 5,000.80
  4. Step 4: Simplify right side
    8,979.28x = 61,964,712.77
  5. Step 5: Solve for x
    x = 61,964,712.77/8,979.28
  6. Step 6: Final answer
    x = 6,900.86

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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.