Home / 20,787.36-28,677.42-12,399

Finding the Fourth Proportional to 20,787.36, 28,677.42 and 12,399

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Solution

The fourth proportional to 20,787.36, 28,677.42 and 12,399 is: 17,105.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.36 : 28,677.42 = 12,399 : x
  2. Step 2: Convert to fraction form
    20,787.36/28,677.42 = 12,399/x
  3. Step 3: Cross multiply
    20,787.36x = 28,677.42 × 12,399
  4. Step 4: Simplify right side
    20,787.36x = 355,571,330.58
  5. Step 5: Solve for x
    x = 355,571,330.58/20,787.36
  6. Step 6: Final answer
    x = 17,105.17

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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.