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Finding the Fourth Proportional to 90,639.64, 135,962.88 and 34,469.28

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Solution

The fourth proportional to 90,639.64, 135,962.88 and 34,469.28 is: 51,705.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,639.64 : 135,962.88 = 34,469.28 : x
  2. Step 2: Convert to fraction form
    90,639.64/135,962.88 = 34,469.28/x
  3. Step 3: Cross multiply
    90,639.64x = 135,962.88 × 34,469.28
  4. Step 4: Simplify right side
    90,639.64x = 4,686,542,580.33
  5. Step 5: Solve for x
    x = 4,686,542,580.33/90,639.64
  6. Step 6: Final answer
    x = 51,705.22

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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.