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Finding the Fourth Proportional to 80,485.78, 120,733.49 and 21,321.28

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Solution

The fourth proportional to 80,485.78, 120,733.49 and 21,321.28 is: 31,983.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,485.78 : 120,733.49 = 21,321.28 : x
  2. Step 2: Convert to fraction form
    80,485.78/120,733.49 = 21,321.28/x
  3. Step 3: Cross multiply
    80,485.78x = 120,733.49 × 21,321.28
  4. Step 4: Simplify right side
    80,485.78x = 2,574,191,950.83
  5. Step 5: Solve for x
    x = 2,574,191,950.83/80,485.78
  6. Step 6: Final answer
    x = 31,983.19

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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.