Home / 20,478.09-28,259.25-13,404.36

Finding the Fourth Proportional to 20,478.09, 28,259.25 and 13,404.36

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Solution

The fourth proportional to 20,478.09, 28,259.25 and 13,404.36 is: 18,497.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,478.09 : 28,259.25 = 13,404.36 : x
  2. Step 2: Convert to fraction form
    20,478.09/28,259.25 = 13,404.36/x
  3. Step 3: Cross multiply
    20,478.09x = 28,259.25 × 13,404.36
  4. Step 4: Simplify right side
    20,478.09x = 378,797,160.33
  5. Step 5: Solve for x
    x = 378,797,160.33/20,478.09
  6. Step 6: Final answer
    x = 18,497.68

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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.