Home / 20,918.82-31,371.56-6,875.60

Finding the Fourth Proportional to 20,918.82, 31,371.56 and 6,875.60

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Solution

The fourth proportional to 20,918.82, 31,371.56 and 6,875.60 is: 10,311.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.82 : 31,371.56 = 6,875.60 : x
  2. Step 2: Convert to fraction form
    20,918.82/31,371.56 = 6,875.60/x
  3. Step 3: Cross multiply
    20,918.82x = 31,371.56 × 6,875.60
  4. Step 4: Simplify right side
    20,918.82x = 215,698,297.94
  5. Step 5: Solve for x
    x = 215,698,297.94/20,918.82
  6. Step 6: Final answer
    x = 10,311.21

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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.