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Finding the Fourth Proportional to 103,938.80, 155,677.80 and 80,489.20

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Solution

The fourth proportional to 103,938.80, 155,677.80 and 80,489.20 is: 120,555.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,938.80 : 155,677.80 = 80,489.20 : x
  2. Step 2: Convert to fraction form
    103,938.80/155,677.80 = 80,489.20/x
  3. Step 3: Cross multiply
    103,938.80x = 155,677.80 × 80,489.20
  4. Step 4: Simplify right side
    103,938.80x = 12,530,381,579.76
  5. Step 5: Solve for x
    x = 12,530,381,579.76/103,938.80
  6. Step 6: Final answer
    x = 120,555.38

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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.