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Finding the Fourth Proportional to 90,639, 135,861.30 and 43,788.60

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Solution

The fourth proportional to 90,639, 135,861.30 and 43,788.60 is: 65,635.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,639 : 135,861.30 = 43,788.60 : x
  2. Step 2: Convert to fraction form
    90,639/135,861.30 = 43,788.60/x
  3. Step 3: Cross multiply
    90,639x = 135,861.30 × 43,788.60
  4. Step 4: Simplify right side
    90,639x = 5,949,176,121.18
  5. Step 5: Solve for x
    x = 5,949,176,121.18/90,639
  6. Step 6: Final answer
    x = 65,635.94

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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.