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Finding the Fourth Proportional to 81,209.62, 121,758.99 and 43,264.56

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Solution

The fourth proportional to 81,209.62, 121,758.99 and 43,264.56 is: 64,867.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,209.62 : 121,758.99 = 43,264.56 : x
  2. Step 2: Convert to fraction form
    81,209.62/121,758.99 = 43,264.56/x
  3. Step 3: Cross multiply
    81,209.62x = 121,758.99 × 43,264.56
  4. Step 4: Simplify right side
    81,209.62x = 5,267,849,128.39
  5. Step 5: Solve for x
    x = 5,267,849,128.39/81,209.62
  6. Step 6: Final answer
    x = 64,867.31

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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.