Home / 20,868.90-31,308.03-7,721.70

Finding the Fourth Proportional to 20,868.90, 31,308.03 and 7,721.70

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Solution

The fourth proportional to 20,868.90, 31,308.03 and 7,721.70 is: 11,584.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,868.90 : 31,308.03 = 7,721.70 : x
  2. Step 2: Convert to fraction form
    20,868.90/31,308.03 = 7,721.70/x
  3. Step 3: Cross multiply
    20,868.90x = 31,308.03 × 7,721.70
  4. Step 4: Simplify right side
    20,868.90x = 241,751,215.25
  5. Step 5: Solve for x
    x = 241,751,215.25/20,868.90
  6. Step 6: Final answer
    x = 11,584.28

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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.