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Finding the Fourth Proportional to 81,076.65, 121,616.84 and 21,107.49

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Solution

The fourth proportional to 81,076.65, 121,616.84 and 21,107.49 is: 31,661.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,076.65 : 121,616.84 = 21,107.49 : x
  2. Step 2: Convert to fraction form
    81,076.65/121,616.84 = 21,107.49/x
  3. Step 3: Cross multiply
    81,076.65x = 121,616.84 × 21,107.49
  4. Step 4: Simplify right side
    81,076.65x = 2,567,025,830.84
  5. Step 5: Solve for x
    x = 2,567,025,830.84/81,076.65
  6. Step 6: Final answer
    x = 31,661.72

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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.