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Finding the Fourth Proportional to 76,879.63, 115,338.88 and 21,475.63

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Solution

The fourth proportional to 76,879.63, 115,338.88 and 21,475.63 is: 32,218.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,879.63 : 115,338.88 = 21,475.63 : x
  2. Step 2: Convert to fraction form
    76,879.63/115,338.88 = 21,475.63/x
  3. Step 3: Cross multiply
    76,879.63x = 115,338.88 × 21,475.63
  4. Step 4: Simplify right side
    76,879.63x = 2,476,974,534.80
  5. Step 5: Solve for x
    x = 2,476,974,534.80/76,879.63
  6. Step 6: Final answer
    x = 32,218.87

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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.