Home / 20,431.44-28,208.43-13,635.15

Finding the Fourth Proportional to 20,431.44, 28,208.43 and 13,635.15

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Solution

The fourth proportional to 20,431.44, 28,208.43 and 13,635.15 is: 18,825.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,431.44 : 28,208.43 = 13,635.15 : x
  2. Step 2: Convert to fraction form
    20,431.44/28,208.43 = 13,635.15/x
  3. Step 3: Cross multiply
    20,431.44x = 28,208.43 × 13,635.15
  4. Step 4: Simplify right side
    20,431.44x = 384,626,174.31
  5. Step 5: Solve for x
    x = 384,626,174.31/20,431.44
  6. Step 6: Final answer
    x = 18,825.21

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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.