Home / 12,278.20-18,401.10-8,811.40

Finding the Fourth Proportional to 12,278.20, 18,401.10 and 8,811.40

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Solution

The fourth proportional to 12,278.20, 18,401.10 and 8,811.40 is: 13,205.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,278.20 : 18,401.10 = 8,811.40 : x
  2. Step 2: Convert to fraction form
    12,278.20/18,401.10 = 8,811.40/x
  3. Step 3: Cross multiply
    12,278.20x = 18,401.10 × 8,811.40
  4. Step 4: Simplify right side
    12,278.20x = 162,139,452.54
  5. Step 5: Solve for x
    x = 162,139,452.54/12,278.20
  6. Step 6: Final answer
    x = 13,205.47

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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.