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Finding the Fourth Proportional to 90,640.62, 135,963.61 and 43,260.70

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Solution

The fourth proportional to 90,640.62, 135,963.61 and 43,260.70 is: 64,892.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,640.62 : 135,963.61 = 43,260.70 : x
  2. Step 2: Convert to fraction form
    90,640.62/135,963.61 = 43,260.70/x
  3. Step 3: Cross multiply
    90,640.62x = 135,963.61 × 43,260.70
  4. Step 4: Simplify right side
    90,640.62x = 5,881,880,943.13
  5. Step 5: Solve for x
    x = 5,881,880,943.13/90,640.62
  6. Step 6: Final answer
    x = 64,892.33

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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.