Home / 20,649.90-28,496.82-11,218.64

Finding the Fourth Proportional to 20,649.90, 28,496.82 and 11,218.64

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Solution

The fourth proportional to 20,649.90, 28,496.82 and 11,218.64 is: 15,481.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,649.90 : 28,496.82 = 11,218.64 : x
  2. Step 2: Convert to fraction form
    20,649.90/28,496.82 = 11,218.64/x
  3. Step 3: Cross multiply
    20,649.90x = 28,496.82 × 11,218.64
  4. Step 4: Simplify right side
    20,649.90x = 319,695,564.72
  5. Step 5: Solve for x
    x = 319,695,564.72/20,649.90
  6. Step 6: Final answer
    x = 15,481.70

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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.