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Finding the Fourth Proportional to 90,708.54, 125,238.87 and 81,118.68

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Solution

The fourth proportional to 90,708.54, 125,238.87 and 81,118.68 is: 111,998.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,708.54 : 125,238.87 = 81,118.68 : x
  2. Step 2: Convert to fraction form
    90,708.54/125,238.87 = 81,118.68/x
  3. Step 3: Cross multiply
    90,708.54x = 125,238.87 × 81,118.68
  4. Step 4: Simplify right side
    90,708.54x = 10,159,211,819.09
  5. Step 5: Solve for x
    x = 10,159,211,819.09/90,708.54
  6. Step 6: Final answer
    x = 111,998.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.