Home / 90,470.20-135,917.37-85,357.81

Finding the Fourth Proportional to 90,470.20, 135,917.37 and 85,357.81

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Solution

The fourth proportional to 90,470.20, 135,917.37 and 85,357.81 is: 128,236.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,470.20 : 135,917.37 = 85,357.81 : x
  2. Step 2: Convert to fraction form
    90,470.20/135,917.37 = 85,357.81/x
  3. Step 3: Cross multiply
    90,470.20x = 135,917.37 × 85,357.81
  4. Step 4: Simplify right side
    90,470.20x = 11,601,609,063.86
  5. Step 5: Solve for x
    x = 11,601,609,063.86/90,470.20
  6. Step 6: Final answer
    x = 128,236.81

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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.