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Finding the Fourth Proportional to 71,718.74, 98,975.37 and 39,886.96

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Solution

The fourth proportional to 71,718.74, 98,975.37 and 39,886.96 is: 55,045.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,718.74 : 98,975.37 = 39,886.96 : x
  2. Step 2: Convert to fraction form
    71,718.74/98,975.37 = 39,886.96/x
  3. Step 3: Cross multiply
    71,718.74x = 98,975.37 × 39,886.96
  4. Step 4: Simplify right side
    71,718.74x = 3,947,825,929.86
  5. Step 5: Solve for x
    x = 3,947,825,929.86/71,718.74
  6. Step 6: Final answer
    x = 55,045.95

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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.