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Finding the Fourth Proportional to 81,277.67, 121,891.30 and 28,674.86

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Solution

The fourth proportional to 81,277.67, 121,891.30 and 28,674.86 is: 43,003.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,277.67 : 121,891.30 = 28,674.86 : x
  2. Step 2: Convert to fraction form
    81,277.67/121,891.30 = 28,674.86/x
  3. Step 3: Cross multiply
    81,277.67x = 121,891.30 × 28,674.86
  4. Step 4: Simplify right side
    81,277.67x = 3,495,215,281.57
  5. Step 5: Solve for x
    x = 3,495,215,281.57/81,277.67
  6. Step 6: Final answer
    x = 43,003.39

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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.