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Finding the Fourth Proportional to 81,491.80, 122,259.30 and 28,895.80

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Solution

The fourth proportional to 81,491.80, 122,259.30 and 28,895.80 is: 43,351.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,491.80 : 122,259.30 = 28,895.80 : x
  2. Step 2: Convert to fraction form
    81,491.80/122,259.30 = 28,895.80/x
  3. Step 3: Cross multiply
    81,491.80x = 122,259.30 × 28,895.80
  4. Step 4: Simplify right side
    81,491.80x = 3,532,780,280.94
  5. Step 5: Solve for x
    x = 3,532,780,280.94/81,491.80
  6. Step 6: Final answer
    x = 43,351.36

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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.