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Finding the Fourth Proportional to 281,491.65, 422,265.20 and 81,813.78

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Solution

The fourth proportional to 281,491.65, 422,265.20 and 81,813.78 is: 122,728.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,491.65 : 422,265.20 = 81,813.78 : x
  2. Step 2: Convert to fraction form
    281,491.65/422,265.20 = 81,813.78/x
  3. Step 3: Cross multiply
    281,491.65x = 422,265.20 × 81,813.78
  4. Step 4: Simplify right side
    281,491.65x = 34,547,111,765.39
  5. Step 5: Solve for x
    x = 34,547,111,765.39/281,491.65
  6. Step 6: Final answer
    x = 122,728.73

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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.