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Finding the Fourth Proportional to 109,620.80, 164,431.20 and 103,169.60

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Solution

The fourth proportional to 109,620.80, 164,431.20 and 103,169.60 is: 154,754.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,620.80 : 164,431.20 = 103,169.60 : x
  2. Step 2: Convert to fraction form
    109,620.80/164,431.20 = 103,169.60/x
  3. Step 3: Cross multiply
    109,620.80x = 164,431.20 × 103,169.60
  4. Step 4: Simplify right side
    109,620.80x = 16,964,301,131.52
  5. Step 5: Solve for x
    x = 16,964,301,131.52/109,620.80
  6. Step 6: Final answer
    x = 154,754.40

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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.