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Finding the Fourth Proportional to 135,801.70, 203,856.15 and 80,428.90

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Solution

The fourth proportional to 135,801.70, 203,856.15 and 80,428.90 is: 120,734.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,801.70 : 203,856.15 = 80,428.90 : x
  2. Step 2: Convert to fraction form
    135,801.70/203,856.15 = 80,428.90/x
  3. Step 3: Cross multiply
    135,801.70x = 203,856.15 × 80,428.90
  4. Step 4: Simplify right side
    135,801.70x = 16,395,925,902.74
  5. Step 5: Solve for x
    x = 16,395,925,902.74/135,801.70
  6. Step 6: Final answer
    x = 120,734.32

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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.