Home / 20,922.48-31,391.40-19,686

Finding the Fourth Proportional to 20,922.48, 31,391.40 and 19,686

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Solution

The fourth proportional to 20,922.48, 31,391.40 and 19,686 is: 29,536.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,922.48 : 31,391.40 = 19,686 : x
  2. Step 2: Convert to fraction form
    20,922.48/31,391.40 = 19,686/x
  3. Step 3: Cross multiply
    20,922.48x = 31,391.40 × 19,686
  4. Step 4: Simplify right side
    20,922.48x = 617,971,100.40
  5. Step 5: Solve for x
    x = 617,971,100.40/20,922.48
  6. Step 6: Final answer
    x = 29,536.23

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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.