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Finding the Fourth Proportional to 80,388.66, 120,581.16 and 21,228.48

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Solution

The fourth proportional to 80,388.66, 120,581.16 and 21,228.48 is: 31,842.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,388.66 : 120,581.16 = 21,228.48 : x
  2. Step 2: Convert to fraction form
    80,388.66/120,581.16 = 21,228.48/x
  3. Step 3: Cross multiply
    80,388.66x = 120,581.16 × 21,228.48
  4. Step 4: Simplify right side
    80,388.66x = 2,559,754,743.44
  5. Step 5: Solve for x
    x = 2,559,754,743.44/80,388.66
  6. Step 6: Final answer
    x = 31,842.24

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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.