Home / 12,121.69-16,723.91-9,879.71

Finding the Fourth Proportional to 12,121.69, 16,723.91 and 9,879.71

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Solution

The fourth proportional to 12,121.69, 16,723.91 and 9,879.71 is: 13,630.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,121.69 : 16,723.91 = 9,879.71 : x
  2. Step 2: Convert to fraction form
    12,121.69/16,723.91 = 9,879.71/x
  3. Step 3: Cross multiply
    12,121.69x = 16,723.91 × 9,879.71
  4. Step 4: Simplify right side
    12,121.69x = 165,227,331.47
  5. Step 5: Solve for x
    x = 165,227,331.47/12,121.69
  6. Step 6: Final answer
    x = 13,630.72

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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.