Home / 20,787.14-28,664.43-13,704.50

Finding the Fourth Proportional to 20,787.14, 28,664.43 and 13,704.50

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Solution

The fourth proportional to 20,787.14, 28,664.43 and 13,704.50 is: 18,897.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.14 : 28,664.43 = 13,704.50 : x
  2. Step 2: Convert to fraction form
    20,787.14/28,664.43 = 13,704.50/x
  3. Step 3: Cross multiply
    20,787.14x = 28,664.43 × 13,704.50
  4. Step 4: Simplify right side
    20,787.14x = 392,831,680.94
  5. Step 5: Solve for x
    x = 392,831,680.94/20,787.14
  6. Step 6: Final answer
    x = 18,897.82

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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.