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Finding the Fourth Proportional to 71,680.44, 98,921.74 and 39,851.69

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Solution

The fourth proportional to 71,680.44, 98,921.74 and 39,851.69 is: 54,996.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,680.44 : 98,921.74 = 39,851.69 : x
  2. Step 2: Convert to fraction form
    71,680.44/98,921.74 = 39,851.69/x
  3. Step 3: Cross multiply
    71,680.44x = 98,921.74 × 39,851.69
  4. Step 4: Simplify right side
    71,680.44x = 3,942,198,516.74
  5. Step 5: Solve for x
    x = 3,942,198,516.74/71,680.44
  6. Step 6: Final answer
    x = 54,996.85

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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.