Home / 20,981.98-31,478.38-7,834.46

Finding the Fourth Proportional to 20,981.98, 31,478.38 and 7,834.46

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Solution

The fourth proportional to 20,981.98, 31,478.38 and 7,834.46 is: 11,753.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.98 : 31,478.38 = 7,834.46 : x
  2. Step 2: Convert to fraction form
    20,981.98/31,478.38 = 7,834.46/x
  3. Step 3: Cross multiply
    20,981.98x = 31,478.38 × 7,834.46
  4. Step 4: Simplify right side
    20,981.98x = 246,616,108.97
  5. Step 5: Solve for x
    x = 246,616,108.97/20,981.98
  6. Step 6: Final answer
    x = 11,753.71

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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.