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Finding the Fourth Proportional to 90,422.40, 135,763.20 and 68,390.40

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Solution

The fourth proportional to 90,422.40, 135,763.20 and 68,390.40 is: 102,683.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,422.40 : 135,763.20 = 68,390.40 : x
  2. Step 2: Convert to fraction form
    90,422.40/135,763.20 = 68,390.40/x
  3. Step 3: Cross multiply
    90,422.40x = 135,763.20 × 68,390.40
  4. Step 4: Simplify right side
    90,422.40x = 9,284,899,553.28
  5. Step 5: Solve for x
    x = 9,284,899,553.28/90,422.40
  6. Step 6: Final answer
    x = 102,683.62

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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.