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Finding the Fourth Proportional to 80,558.70, 120,828.75 and 21,399.13

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Solution

The fourth proportional to 80,558.70, 120,828.75 and 21,399.13 is: 32,096.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,558.70 : 120,828.75 = 21,399.13 : x
  2. Step 2: Convert to fraction form
    80,558.70/120,828.75 = 21,399.13/x
  3. Step 3: Cross multiply
    80,558.70x = 120,828.75 × 21,399.13
  4. Step 4: Simplify right side
    80,558.70x = 2,585,630,128.99
  5. Step 5: Solve for x
    x = 2,585,630,128.99/80,558.70
  6. Step 6: Final answer
    x = 32,096.22

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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.