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Finding the Fourth Proportional to 13,321.74, 19,995.78 and 7,081.77

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Solution

The fourth proportional to 13,321.74, 19,995.78 and 7,081.77 is: 10,629.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,321.74 : 19,995.78 = 7,081.77 : x
  2. Step 2: Convert to fraction form
    13,321.74/19,995.78 = 7,081.77/x
  3. Step 3: Cross multiply
    13,321.74x = 19,995.78 × 7,081.77
  4. Step 4: Simplify right side
    13,321.74x = 141,605,514.93
  5. Step 5: Solve for x
    x = 141,605,514.93/13,321.74
  6. Step 6: Final answer
    x = 10,629.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.