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Finding the Fourth Proportional to 90,764.20, 135,854.70 and 64,520.20

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Solution

The fourth proportional to 90,764.20, 135,854.70 and 64,520.20 is: 96,573.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,764.20 : 135,854.70 = 64,520.20 : x
  2. Step 2: Convert to fraction form
    90,764.20/135,854.70 = 64,520.20/x
  3. Step 3: Cross multiply
    90,764.20x = 135,854.70 × 64,520.20
  4. Step 4: Simplify right side
    90,764.20x = 8,765,372,414.94
  5. Step 5: Solve for x
    x = 8,765,372,414.94/90,764.20
  6. Step 6: Final answer
    x = 96,573.01

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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.