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Finding the Fourth Proportional to 109,402.60, 164,103.90 and 91,906.60

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Solution

The fourth proportional to 109,402.60, 164,103.90 and 91,906.60 is: 137,859.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,402.60 : 164,103.90 = 91,906.60 : x
  2. Step 2: Convert to fraction form
    109,402.60/164,103.90 = 91,906.60/x
  3. Step 3: Cross multiply
    109,402.60x = 164,103.90 × 91,906.60
  4. Step 4: Simplify right side
    109,402.60x = 15,082,231,495.74
  5. Step 5: Solve for x
    x = 15,082,231,495.74/109,402.60
  6. Step 6: Final answer
    x = 137,859.90

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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.