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Finding the Fourth Proportional to 71,690.83, 98,933.11 and 39,859.72

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Solution

The fourth proportional to 71,690.83, 98,933.11 and 39,859.72 is: 55,006.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,690.83 : 98,933.11 = 39,859.72 : x
  2. Step 2: Convert to fraction form
    71,690.83/98,933.11 = 39,859.72/x
  3. Step 3: Cross multiply
    71,690.83x = 98,933.11 × 39,859.72
  4. Step 4: Simplify right side
    71,690.83x = 3,943,446,063.33
  5. Step 5: Solve for x
    x = 3,943,446,063.33/71,690.83
  6. Step 6: Final answer
    x = 55,006.28

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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.