Home / 15,131.41-20,879.78-8,416.51

Finding the Fourth Proportional to 15,131.41, 20,879.78 and 8,416.51

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Solution

The fourth proportional to 15,131.41, 20,879.78 and 8,416.51 is: 11,613.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,131.41 : 20,879.78 = 8,416.51 : x
  2. Step 2: Convert to fraction form
    15,131.41/20,879.78 = 8,416.51/x
  3. Step 3: Cross multiply
    15,131.41x = 20,879.78 × 8,416.51
  4. Step 4: Simplify right side
    15,131.41x = 175,734,782.89
  5. Step 5: Solve for x
    x = 175,734,782.89/15,131.41
  6. Step 6: Final answer
    x = 11,613.91

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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.