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Finding the Fourth Proportional to 71,722.80, 98,974.80 and 39,891

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Solution

The fourth proportional to 71,722.80, 98,974.80 and 39,891 is: 55,048.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,722.80 : 98,974.80 = 39,891 : x
  2. Step 2: Convert to fraction form
    71,722.80/98,974.80 = 39,891/x
  3. Step 3: Cross multiply
    71,722.80x = 98,974.80 × 39,891
  4. Step 4: Simplify right side
    71,722.80x = 3,948,203,746.80
  5. Step 5: Solve for x
    x = 3,948,203,746.80/71,722.80
  6. Step 6: Final answer
    x = 55,048.10

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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.