Home / 8,790.92-12,115.10-7,209.80

Finding the Fourth Proportional to 8,790.92, 12,115.10 and 7,209.80

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Solution

The fourth proportional to 8,790.92, 12,115.10 and 7,209.80 is: 9,936.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,790.92 : 12,115.10 = 7,209.80 : x
  2. Step 2: Convert to fraction form
    8,790.92/12,115.10 = 7,209.80/x
  3. Step 3: Cross multiply
    8,790.92x = 12,115.10 × 7,209.80
  4. Step 4: Simplify right side
    8,790.92x = 87,347,447.98
  5. Step 5: Solve for x
    x = 87,347,447.98/8,790.92
  6. Step 6: Final answer
    x = 9,936.10

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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.