Home / 20,412-28,180.08-15,435.36

Finding the Fourth Proportional to 20,412, 28,180.08 and 15,435.36

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Solution

The fourth proportional to 20,412, 28,180.08 and 15,435.36 is: 21,309.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,412 : 28,180.08 = 15,435.36 : x
  2. Step 2: Convert to fraction form
    20,412/28,180.08 = 15,435.36/x
  3. Step 3: Cross multiply
    20,412x = 28,180.08 × 15,435.36
  4. Step 4: Simplify right side
    20,412x = 434,969,679.63
  5. Step 5: Solve for x
    x = 434,969,679.63/20,412
  6. Step 6: Final answer
    x = 21,309.51

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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.