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Finding the Fourth Proportional to 90,298.62, 135,579.42 and 66,679.02

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Solution

The fourth proportional to 90,298.62, 135,579.42 and 66,679.02 is: 100,115.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,298.62 : 135,579.42 = 66,679.02 : x
  2. Step 2: Convert to fraction form
    90,298.62/135,579.42 = 66,679.02/x
  3. Step 3: Cross multiply
    90,298.62x = 135,579.42 × 66,679.02
  4. Step 4: Simplify right side
    90,298.62x = 9,040,302,857.77
  5. Step 5: Solve for x
    x = 9,040,302,857.77/90,298.62
  6. Step 6: Final answer
    x = 100,115.63

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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.