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Finding the Fourth Proportional to 90,639.62, 135,962.11 and 43,259.70

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Solution

The fourth proportional to 90,639.62, 135,962.11 and 43,259.70 is: 64,890.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,639.62 : 135,962.11 = 43,259.70 : x
  2. Step 2: Convert to fraction form
    90,639.62/135,962.11 = 43,259.70/x
  3. Step 3: Cross multiply
    90,639.62x = 135,962.11 × 43,259.70
  4. Step 4: Simplify right side
    90,639.62x = 5,881,680,653.90
  5. Step 5: Solve for x
    x = 5,881,680,653.90/90,639.62
  6. Step 6: Final answer
    x = 64,890.84

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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.