Home / 71,721.38-98,974.10-39,889.60

Finding the Fourth Proportional to 71,721.38, 98,974.10 and 39,889.60

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Solution

The fourth proportional to 71,721.38, 98,974.10 and 39,889.60 is: 55,046.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,721.38 : 98,974.10 = 39,889.60 : x
  2. Step 2: Convert to fraction form
    71,721.38/98,974.10 = 39,889.60/x
  3. Step 3: Cross multiply
    71,721.38x = 98,974.10 × 39,889.60
  4. Step 4: Simplify right side
    71,721.38x = 3,948,037,111.65
  5. Step 5: Solve for x
    x = 3,948,037,111.65/71,721.38
  6. Step 6: Final answer
    x = 55,046.86

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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.