Home / 12,138.20-18,207.30-9,677.78

Finding the Fourth Proportional to 12,138.20, 18,207.30 and 9,677.78

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Solution

The fourth proportional to 12,138.20, 18,207.30 and 9,677.78 is: 14,516.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.20 : 18,207.30 = 9,677.78 : x
  2. Step 2: Convert to fraction form
    12,138.20/18,207.30 = 9,677.78/x
  3. Step 3: Cross multiply
    12,138.20x = 18,207.30 × 9,677.78
  4. Step 4: Simplify right side
    12,138.20x = 176,206,243.79
  5. Step 5: Solve for x
    x = 176,206,243.79/12,138.20
  6. Step 6: Final answer
    x = 14,516.67

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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.