Home / 12,121.50-16,727.88-7,929.75

Finding the Fourth Proportional to 12,121.50, 16,727.88 and 7,929.75

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Solution

The fourth proportional to 12,121.50, 16,727.88 and 7,929.75 is: 10,943.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,121.50 : 16,727.88 = 7,929.75 : x
  2. Step 2: Convert to fraction form
    12,121.50/16,727.88 = 7,929.75/x
  3. Step 3: Cross multiply
    12,121.50x = 16,727.88 × 7,929.75
  4. Step 4: Simplify right side
    12,121.50x = 132,647,866.78
  5. Step 5: Solve for x
    x = 132,647,866.78/12,121.50
  6. Step 6: Final answer
    x = 10,943.19

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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.