Home / 420,761.08-631,147.20-140,278.42

Finding the Fourth Proportional to 420,761.08, 631,147.20 and 140,278.42

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Solution

The fourth proportional to 420,761.08, 631,147.20 and 140,278.42 is: 210,419.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,761.08 : 631,147.20 = 140,278.42 : x
  2. Step 2: Convert to fraction form
    420,761.08/631,147.20 = 140,278.42/x
  3. Step 3: Cross multiply
    420,761.08x = 631,147.20 × 140,278.42
  4. Step 4: Simplify right side
    420,761.08x = 88,536,332,003.42
  5. Step 5: Solve for x
    x = 88,536,332,003.42/420,761.08
  6. Step 6: Final answer
    x = 210,419.49

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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.