Home / 20,908.17-31,377-9,815.22

Finding the Fourth Proportional to 20,908.17, 31,377 and 9,815.22

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Solution

The fourth proportional to 20,908.17, 31,377 and 9,815.22 is: 14,729.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,908.17 : 31,377 = 9,815.22 : x
  2. Step 2: Convert to fraction form
    20,908.17/31,377 = 9,815.22/x
  3. Step 3: Cross multiply
    20,908.17x = 31,377 × 9,815.22
  4. Step 4: Simplify right side
    20,908.17x = 307,972,157.94
  5. Step 5: Solve for x
    x = 307,972,157.94/20,908.17
  6. Step 6: Final answer
    x = 14,729.75

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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.