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Finding the Fourth Proportional to 81,228.62, 121,830.59 and 27,928.68

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Solution

The fourth proportional to 81,228.62, 121,830.59 and 27,928.68 is: 41,888.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,228.62 : 121,830.59 = 27,928.68 : x
  2. Step 2: Convert to fraction form
    81,228.62/121,830.59 = 27,928.68/x
  3. Step 3: Cross multiply
    81,228.62x = 121,830.59 × 27,928.68
  4. Step 4: Simplify right side
    81,228.62x = 3,402,567,422.68
  5. Step 5: Solve for x
    x = 3,402,567,422.68/81,228.62
  6. Step 6: Final answer
    x = 41,888.78

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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.