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Finding the Fourth Proportional to 71,879.63, 99,194.57 and 39,615.42

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Solution

The fourth proportional to 71,879.63, 99,194.57 and 39,615.42 is: 54,669.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,879.63 : 99,194.57 = 39,615.42 : x
  2. Step 2: Convert to fraction form
    71,879.63/99,194.57 = 39,615.42/x
  3. Step 3: Cross multiply
    71,879.63x = 99,194.57 × 39,615.42
  4. Step 4: Simplify right side
    71,879.63x = 3,929,634,400.10
  5. Step 5: Solve for x
    x = 3,929,634,400.10/71,879.63
  6. Step 6: Final answer
    x = 54,669.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.