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Finding the Fourth Proportional to 90,761.60, 135,980.40 and 43,911.20

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Solution

The fourth proportional to 90,761.60, 135,980.40 and 43,911.20 is: 65,788.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,761.60 : 135,980.40 = 43,911.20 : x
  2. Step 2: Convert to fraction form
    90,761.60/135,980.40 = 43,911.20/x
  3. Step 3: Cross multiply
    90,761.60x = 135,980.40 × 43,911.20
  4. Step 4: Simplify right side
    90,761.60x = 5,971,062,540.48
  5. Step 5: Solve for x
    x = 5,971,062,540.48/90,761.60
  6. Step 6: Final answer
    x = 65,788.42

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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.