Home / 20,972.34-31,451.85-6,929.78

Finding the Fourth Proportional to 20,972.34, 31,451.85 and 6,929.78

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Solution

The fourth proportional to 20,972.34, 31,451.85 and 6,929.78 is: 10,392.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,972.34 : 31,451.85 = 6,929.78 : x
  2. Step 2: Convert to fraction form
    20,972.34/31,451.85 = 6,929.78/x
  3. Step 3: Cross multiply
    20,972.34x = 31,451.85 × 6,929.78
  4. Step 4: Simplify right side
    20,972.34x = 217,954,243.83
  5. Step 5: Solve for x
    x = 217,954,243.83/20,972.34
  6. Step 6: Final answer
    x = 10,392.46

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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.