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Finding the Fourth Proportional to 198,139.80, 297,209.70 and 79,750.20

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Solution

The fourth proportional to 198,139.80, 297,209.70 and 79,750.20 is: 119,625.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    198,139.80 : 297,209.70 = 79,750.20 : x
  2. Step 2: Convert to fraction form
    198,139.80/297,209.70 = 79,750.20/x
  3. Step 3: Cross multiply
    198,139.80x = 297,209.70 × 79,750.20
  4. Step 4: Simplify right side
    198,139.80x = 23,702,533,016.94
  5. Step 5: Solve for x
    x = 23,702,533,016.94/198,139.80
  6. Step 6: Final answer
    x = 119,625.30

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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.