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Finding the Fourth Proportional to 81,158.69, 121,744.94 and 21,195.11

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Solution

The fourth proportional to 81,158.69, 121,744.94 and 21,195.11 is: 31,794.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,158.69 : 121,744.94 = 21,195.11 : x
  2. Step 2: Convert to fraction form
    81,158.69/121,744.94 = 21,195.11/x
  3. Step 3: Cross multiply
    81,158.69x = 121,744.94 × 21,195.11
  4. Step 4: Simplify right side
    81,158.69x = 2,580,397,593.63
  5. Step 5: Solve for x
    x = 2,580,397,593.63/81,158.69
  6. Step 6: Final answer
    x = 31,794.47

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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.