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Finding the Fourth Proportional to 81,015.20, 121,522.80 and 68,184.80

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Solution

The fourth proportional to 81,015.20, 121,522.80 and 68,184.80 is: 102,277.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,015.20 : 121,522.80 = 68,184.80 : x
  2. Step 2: Convert to fraction form
    81,015.20/121,522.80 = 68,184.80/x
  3. Step 3: Cross multiply
    81,015.20x = 121,522.80 × 68,184.80
  4. Step 4: Simplify right side
    81,015.20x = 8,286,007,813.44
  5. Step 5: Solve for x
    x = 8,286,007,813.44/81,015.20
  6. Step 6: Final answer
    x = 102,277.20

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1.5x scale

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.