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Finding the Fourth Proportional to 18,172.70, 25,067.87 and 11,354.90

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Solution

The fourth proportional to 18,172.70, 25,067.87 and 11,354.90 is: 15,663.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,172.70 : 25,067.87 = 11,354.90 : x
  2. Step 2: Convert to fraction form
    18,172.70/25,067.87 = 11,354.90/x
  3. Step 3: Cross multiply
    18,172.70x = 25,067.87 × 11,354.90
  4. Step 4: Simplify right side
    18,172.70x = 284,643,111.53
  5. Step 5: Solve for x
    x = 284,643,111.53/18,172.70
  6. Step 6: Final answer
    x = 15,663.22

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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.