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Finding the Fourth Proportional to 90,628.70, 135,943.05 and 81,443.30

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Solution

The fourth proportional to 90,628.70, 135,943.05 and 81,443.30 is: 122,164.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,628.70 : 135,943.05 = 81,443.30 : x
  2. Step 2: Convert to fraction form
    90,628.70/135,943.05 = 81,443.30/x
  3. Step 3: Cross multiply
    90,628.70x = 135,943.05 × 81,443.30
  4. Step 4: Simplify right side
    90,628.70x = 11,071,650,604.07
  5. Step 5: Solve for x
    x = 11,071,650,604.07/90,628.70
  6. Step 6: Final answer
    x = 122,164.95

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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.