Home / 20,871.05-31,318.85-7,732.58

Finding the Fourth Proportional to 20,871.05, 31,318.85 and 7,732.58

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Solution

The fourth proportional to 20,871.05, 31,318.85 and 7,732.58 is: 11,603.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.05 : 31,318.85 = 7,732.58 : x
  2. Step 2: Convert to fraction form
    20,871.05/31,318.85 = 7,732.58/x
  3. Step 3: Cross multiply
    20,871.05x = 31,318.85 × 7,732.58
  4. Step 4: Simplify right side
    20,871.05x = 242,175,375.87
  5. Step 5: Solve for x
    x = 242,175,375.87/20,871.05
  6. Step 6: Final answer
    x = 11,603.41

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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.