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Finding the Fourth Proportional to 85,500.80, 128,251.20 and 80,908.10

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Solution

The fourth proportional to 85,500.80, 128,251.20 and 80,908.10 is: 121,362.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,500.80 : 128,251.20 = 80,908.10 : x
  2. Step 2: Convert to fraction form
    85,500.80/128,251.20 = 80,908.10/x
  3. Step 3: Cross multiply
    85,500.80x = 128,251.20 × 80,908.10
  4. Step 4: Simplify right side
    85,500.80x = 10,376,560,914.72
  5. Step 5: Solve for x
    x = 10,376,560,914.72/85,500.80
  6. Step 6: Final answer
    x = 121,362.15

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1.5x scale

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.