Home / 11,105.80-15,327.68-6,389.78

Finding the Fourth Proportional to 11,105.80, 15,327.68 and 6,389.78

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Solution

The fourth proportional to 11,105.80, 15,327.68 and 6,389.78 is: 8,818.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,105.80 : 15,327.68 = 6,389.78 : x
  2. Step 2: Convert to fraction form
    11,105.80/15,327.68 = 6,389.78/x
  3. Step 3: Cross multiply
    11,105.80x = 15,327.68 × 6,389.78
  4. Step 4: Simplify right side
    11,105.80x = 97,940,503.11
  5. Step 5: Solve for x
    x = 97,940,503.11/11,105.80
  6. Step 6: Final answer
    x = 8,818.86

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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.