Home / 20,622.78-30,894.31-12,309.42

Finding the Fourth Proportional to 20,622.78, 30,894.31 and 12,309.42

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Solution

The fourth proportional to 20,622.78, 30,894.31 and 12,309.42 is: 18,440.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,622.78 : 30,894.31 = 12,309.42 : x
  2. Step 2: Convert to fraction form
    20,622.78/30,894.31 = 12,309.42/x
  3. Step 3: Cross multiply
    20,622.78x = 30,894.31 × 12,309.42
  4. Step 4: Simplify right side
    20,622.78x = 380,291,037.40
  5. Step 5: Solve for x
    x = 380,291,037.40/20,622.78
  6. Step 6: Final answer
    x = 18,440.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.