Home / 90,839.20-135,999.60-80,471.20

Finding the Fourth Proportional to 90,839.20, 135,999.60 and 80,471.20

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Solution

The fourth proportional to 90,839.20, 135,999.60 and 80,471.20 is: 120,477.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,839.20 : 135,999.60 = 80,471.20 : x
  2. Step 2: Convert to fraction form
    90,839.20/135,999.60 = 80,471.20/x
  3. Step 3: Cross multiply
    90,839.20x = 135,999.60 × 80,471.20
  4. Step 4: Simplify right side
    90,839.20x = 10,944,051,011.52
  5. Step 5: Solve for x
    x = 10,944,051,011.52/90,839.20
  6. Step 6: Final answer
    x = 120,477.18

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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.