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Finding the Fourth Proportional to 81,990.70, 122,986.05 and 26,586.70

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Solution

The fourth proportional to 81,990.70, 122,986.05 and 26,586.70 is: 39,880.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,990.70 : 122,986.05 = 26,586.70 : x
  2. Step 2: Convert to fraction form
    81,990.70/122,986.05 = 26,586.70/x
  3. Step 3: Cross multiply
    81,990.70x = 122,986.05 × 26,586.70
  4. Step 4: Simplify right side
    81,990.70x = 3,269,793,215.54
  5. Step 5: Solve for x
    x = 3,269,793,215.54/81,990.70
  6. Step 6: Final answer
    x = 39,880.05

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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.