Home / 20,892.31-28,821.29-13,719.43

Finding the Fourth Proportional to 20,892.31, 28,821.29 and 13,719.43

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Solution

The fourth proportional to 20,892.31, 28,821.29 and 13,719.43 is: 18,926.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,892.31 : 28,821.29 = 13,719.43 : x
  2. Step 2: Convert to fraction form
    20,892.31/28,821.29 = 13,719.43/x
  3. Step 3: Cross multiply
    20,892.31x = 28,821.29 × 13,719.43
  4. Step 4: Simplify right side
    20,892.31x = 395,411,670.66
  5. Step 5: Solve for x
    x = 395,411,670.66/20,892.31
  6. Step 6: Final answer
    x = 18,926.18

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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.