Home / 80,688.20-120,974.70-45,638.60

Finding the Fourth Proportional to 80,688.20, 120,974.70 and 45,638.60

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Solution

The fourth proportional to 80,688.20, 120,974.70 and 45,638.60 is: 68,425.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,688.20 : 120,974.70 = 45,638.60 : x
  2. Step 2: Convert to fraction form
    80,688.20/120,974.70 = 45,638.60/x
  3. Step 3: Cross multiply
    80,688.20x = 120,974.70 × 45,638.60
  4. Step 4: Simplify right side
    80,688.20x = 5,521,115,943.42
  5. Step 5: Solve for x
    x = 5,521,115,943.42/80,688.20
  6. Step 6: Final answer
    x = 68,425.32

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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.