Home / 90,651.21-135,930.11-40,688.49

Finding the Fourth Proportional to 90,651.21, 135,930.11 and 40,688.49

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Solution

The fourth proportional to 90,651.21, 135,930.11 and 40,688.49 is: 61,011.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,651.21 : 135,930.11 = 40,688.49 : x
  2. Step 2: Convert to fraction form
    90,651.21/135,930.11 = 40,688.49/x
  3. Step 3: Cross multiply
    90,651.21x = 135,930.11 × 40,688.49
  4. Step 4: Simplify right side
    90,651.21x = 5,530,790,921.43
  5. Step 5: Solve for x
    x = 5,530,790,921.43/90,651.21
  6. Step 6: Final answer
    x = 61,011.77

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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.