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Finding the Fourth Proportional to 22,791.87, 31,449.96 and 12,720.87

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Solution

The fourth proportional to 22,791.87, 31,449.96 and 12,720.87 is: 17,553.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,791.87 : 31,449.96 = 12,720.87 : x
  2. Step 2: Convert to fraction form
    22,791.87/31,449.96 = 12,720.87/x
  3. Step 3: Cross multiply
    22,791.87x = 31,449.96 × 12,720.87
  4. Step 4: Simplify right side
    22,791.87x = 400,070,852.67
  5. Step 5: Solve for x
    x = 400,070,852.67/22,791.87
  6. Step 6: Final answer
    x = 17,553.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.