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Finding the Fourth Proportional to 71,717.64, 98,968.92 and 39,885.78

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Solution

The fourth proportional to 71,717.64, 98,968.92 and 39,885.78 is: 55,041.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,717.64 : 98,968.92 = 39,885.78 : x
  2. Step 2: Convert to fraction form
    71,717.64/98,968.92 = 39,885.78/x
  3. Step 3: Cross multiply
    71,717.64x = 98,968.92 × 39,885.78
  4. Step 4: Simplify right side
    71,717.64x = 3,947,452,569.96
  5. Step 5: Solve for x
    x = 3,947,452,569.96/71,717.64
  6. Step 6: Final answer
    x = 55,041.58

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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.