Home / 20,514.72-28,288.80-12,129.60

Finding the Fourth Proportional to 20,514.72, 28,288.80 and 12,129.60

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Solution

The fourth proportional to 20,514.72, 28,288.80 and 12,129.60 is: 16,726.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,514.72 : 28,288.80 = 12,129.60 : x
  2. Step 2: Convert to fraction form
    20,514.72/28,288.80 = 12,129.60/x
  3. Step 3: Cross multiply
    20,514.72x = 28,288.80 × 12,129.60
  4. Step 4: Simplify right side
    20,514.72x = 343,131,828.48
  5. Step 5: Solve for x
    x = 343,131,828.48/20,514.72
  6. Step 6: Final answer
    x = 16,726.13

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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.