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Finding the Fourth Proportional to 330,139.80, 495,204.84 and 80,821.80

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Solution

The fourth proportional to 330,139.80, 495,204.84 and 80,821.80 is: 121,231.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    330,139.80 : 495,204.84 = 80,821.80 : x
  2. Step 2: Convert to fraction form
    330,139.80/495,204.84 = 80,821.80/x
  3. Step 3: Cross multiply
    330,139.80x = 495,204.84 × 80,821.80
  4. Step 4: Simplify right side
    330,139.80x = 40,023,346,537.51
  5. Step 5: Solve for x
    x = 40,023,346,537.51/330,139.80
  6. Step 6: Final answer
    x = 121,231.51

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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.