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Finding the Fourth Proportional to 198,615.78, 297,830.05 and 72,166.88

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Solution

The fourth proportional to 198,615.78, 297,830.05 and 72,166.88 is: 108,216.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    198,615.78 : 297,830.05 = 72,166.88 : x
  2. Step 2: Convert to fraction form
    198,615.78/297,830.05 = 72,166.88/x
  3. Step 3: Cross multiply
    198,615.78x = 297,830.05 × 72,166.88
  4. Step 4: Simplify right side
    198,615.78x = 21,493,466,042.90
  5. Step 5: Solve for x
    x = 21,493,466,042.90/198,615.78
  6. Step 6: Final answer
    x = 108,216.31

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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.