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Finding the Fourth Proportional to 81,166.65, 121,718.98 and 39,020.12

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Solution

The fourth proportional to 81,166.65, 121,718.98 and 39,020.12 is: 58,515.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,166.65 : 121,718.98 = 39,020.12 : x
  2. Step 2: Convert to fraction form
    81,166.65/121,718.98 = 39,020.12/x
  3. Step 3: Cross multiply
    81,166.65x = 121,718.98 × 39,020.12
  4. Step 4: Simplify right side
    81,166.65x = 4,749,489,205.88
  5. Step 5: Solve for x
    x = 4,749,489,205.88/81,166.65
  6. Step 6: Final answer
    x = 58,515.28

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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.