Home / 120,138.78-180,180.23-45,266.43

Finding the Fourth Proportional to 120,138.78, 180,180.23 and 45,266.43

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Solution

The fourth proportional to 120,138.78, 180,180.23 and 45,266.43 is: 67,889.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,138.78 : 180,180.23 = 45,266.43 : x
  2. Step 2: Convert to fraction form
    120,138.78/180,180.23 = 45,266.43/x
  3. Step 3: Cross multiply
    120,138.78x = 180,180.23 × 45,266.43
  4. Step 4: Simplify right side
    120,138.78x = 8,156,115,542.35
  5. Step 5: Solve for x
    x = 8,156,115,542.35/120,138.78
  6. Step 6: Final answer
    x = 67,889.12

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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.