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Finding the Fourth Proportional to 198,615.20, 297,663.60 and 91,986.80

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Solution

The fourth proportional to 198,615.20, 297,663.60 and 91,986.80 is: 137,860.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    198,615.20 : 297,663.60 = 91,986.80 : x
  2. Step 2: Convert to fraction form
    198,615.20/297,663.60 = 91,986.80/x
  3. Step 3: Cross multiply
    198,615.20x = 297,663.60 × 91,986.80
  4. Step 4: Simplify right side
    198,615.20x = 27,381,122,040.48
  5. Step 5: Solve for x
    x = 27,381,122,040.48/198,615.20
  6. Step 6: Final answer
    x = 137,860.15

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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.