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Finding the Fourth Proportional to 80,485.80, 120,723.30 and 21,320.20

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Solution

The fourth proportional to 80,485.80, 120,723.30 and 21,320.20 is: 31,978.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,485.80 : 120,723.30 = 21,320.20 : x
  2. Step 2: Convert to fraction form
    80,485.80/120,723.30 = 21,320.20/x
  3. Step 3: Cross multiply
    80,485.80x = 120,723.30 × 21,320.20
  4. Step 4: Simplify right side
    80,485.80x = 2,573,844,900.66
  5. Step 5: Solve for x
    x = 2,573,844,900.66/80,485.80
  6. Step 6: Final answer
    x = 31,978.87

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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.