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Finding the Fourth Proportional to 90,611.50, 135,936.70 and 35,207.50

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Solution

The fourth proportional to 90,611.50, 135,936.70 and 35,207.50 is: 52,818.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,611.50 : 135,936.70 = 35,207.50 : x
  2. Step 2: Convert to fraction form
    90,611.50/135,936.70 = 35,207.50/x
  3. Step 3: Cross multiply
    90,611.50x = 135,936.70 × 35,207.50
  4. Step 4: Simplify right side
    90,611.50x = 4,785,991,365.25
  5. Step 5: Solve for x
    x = 4,785,991,365.25/90,611.50
  6. Step 6: Final answer
    x = 52,818.81

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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.