Home / 90,411.40-135,617.10-80,734.60

Finding the Fourth Proportional to 90,411.40, 135,617.10 and 80,734.60

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Solution

The fourth proportional to 90,411.40, 135,617.10 and 80,734.60 is: 121,101.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,411.40 : 135,617.10 = 80,734.60 : x
  2. Step 2: Convert to fraction form
    90,411.40/135,617.10 = 80,734.60/x
  3. Step 3: Cross multiply
    90,411.40x = 135,617.10 × 80,734.60
  4. Step 4: Simplify right side
    90,411.40x = 10,948,992,321.66
  5. Step 5: Solve for x
    x = 10,948,992,321.66/90,411.40
  6. Step 6: Final answer
    x = 121,101.90

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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.