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Finding the Fourth Proportional to 80,484.80, 120,721.80 and 21,319.20

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Solution

The fourth proportional to 80,484.80, 120,721.80 and 21,319.20 is: 31,977.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,484.80 : 120,721.80 = 21,319.20 : x
  2. Step 2: Convert to fraction form
    80,484.80/120,721.80 = 21,319.20/x
  3. Step 3: Cross multiply
    80,484.80x = 120,721.80 × 21,319.20
  4. Step 4: Simplify right side
    80,484.80x = 2,573,692,198.56
  5. Step 5: Solve for x
    x = 2,573,692,198.56/80,484.80
  6. Step 6: Final answer
    x = 31,977.37

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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.