Home / 20,790-28,686.96-11,837.88

Finding the Fourth Proportional to 20,790, 28,686.96 and 11,837.88

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Solution

The fourth proportional to 20,790, 28,686.96 and 11,837.88 is: 16,334.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,790 : 28,686.96 = 11,837.88 : x
  2. Step 2: Convert to fraction form
    20,790/28,686.96 = 11,837.88/x
  3. Step 3: Cross multiply
    20,790x = 28,686.96 × 11,837.88
  4. Step 4: Simplify right side
    20,790x = 339,592,790.04
  5. Step 5: Solve for x
    x = 339,592,790.04/20,790
  6. Step 6: Final answer
    x = 16,334.43

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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.