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Finding the Fourth Proportional to 45,709.80, 68,573.28 and 20,751.61

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Solution

The fourth proportional to 45,709.80, 68,573.28 and 20,751.61 is: 31,131.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,709.80 : 68,573.28 = 20,751.61 : x
  2. Step 2: Convert to fraction form
    45,709.80/68,573.28 = 20,751.61/x
  3. Step 3: Cross multiply
    45,709.80x = 68,573.28 × 20,751.61
  4. Step 4: Simplify right side
    45,709.80x = 1,423,005,620.11
  5. Step 5: Solve for x
    x = 1,423,005,620.11/45,709.80
  6. Step 6: Final answer
    x = 31,131.30

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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.