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Finding the Fourth Proportional to 71,879.80, 99,194.78 and 39,615.57

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Solution

The fourth proportional to 71,879.80, 99,194.78 and 39,615.57 is: 54,669.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,879.80 : 99,194.78 = 39,615.57 : x
  2. Step 2: Convert to fraction form
    71,879.80/99,194.78 = 39,615.57/x
  3. Step 3: Cross multiply
    71,879.80x = 99,194.78 × 39,615.57
  4. Step 4: Simplify right side
    71,879.80x = 3,929,658,051.98
  5. Step 5: Solve for x
    x = 3,929,658,051.98/71,879.80
  6. Step 6: Final answer
    x = 54,669.85

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1.5x scale

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.