Home / 8,125.20-12,212.10-7,979.40

Finding the Fourth Proportional to 8,125.20, 12,212.10 and 7,979.40

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Solution

The fourth proportional to 8,125.20, 12,212.10 and 7,979.40 is: 11,992.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,125.20 : 12,212.10 = 7,979.40 : x
  2. Step 2: Convert to fraction form
    8,125.20/12,212.10 = 7,979.40/x
  3. Step 3: Cross multiply
    8,125.20x = 12,212.10 × 7,979.40
  4. Step 4: Simplify right side
    8,125.20x = 97,445,230.74
  5. Step 5: Solve for x
    x = 97,445,230.74/8,125.20
  6. Step 6: Final answer
    x = 11,992.96

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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.