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Finding the Fourth Proportional to 15,131.19, 20,879.04 and 8,415.48

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Solution

The fourth proportional to 15,131.19, 20,879.04 and 8,415.48 is: 11,612.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,131.19 : 20,879.04 = 8,415.48 : x
  2. Step 2: Convert to fraction form
    15,131.19/20,879.04 = 8,415.48/x
  3. Step 3: Cross multiply
    15,131.19x = 20,879.04 × 8,415.48
  4. Step 4: Simplify right side
    15,131.19x = 175,707,143.54
  5. Step 5: Solve for x
    x = 175,707,143.54/15,131.19
  6. Step 6: Final answer
    x = 11,612.25

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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.