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Finding the Fourth Proportional to 81,165.20, 121,690.20 and 36,813.20

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Solution

The fourth proportional to 81,165.20, 121,690.20 and 36,813.20 is: 55,193.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,165.20 : 121,690.20 = 36,813.20 : x
  2. Step 2: Convert to fraction form
    81,165.20/121,690.20 = 36,813.20/x
  3. Step 3: Cross multiply
    81,165.20x = 121,690.20 × 36,813.20
  4. Step 4: Simplify right side
    81,165.20x = 4,479,805,670.64
  5. Step 5: Solve for x
    x = 4,479,805,670.64/81,165.20
  6. Step 6: Final answer
    x = 55,193.68

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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.