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Finding the Fourth Proportional to 89,990.89, 134,693.38 and 66,289.11

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Solution

The fourth proportional to 89,990.89, 134,693.38 and 66,289.11 is: 99,217.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,990.89 : 134,693.38 = 66,289.11 : x
  2. Step 2: Convert to fraction form
    89,990.89/134,693.38 = 66,289.11/x
  3. Step 3: Cross multiply
    89,990.89x = 134,693.38 × 66,289.11
  4. Step 4: Simplify right side
    89,990.89x = 8,928,704,283.09
  5. Step 5: Solve for x
    x = 8,928,704,283.09/89,990.89
  6. Step 6: Final answer
    x = 99,217.87

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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.