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Finding the Fourth Proportional to 38,455, 53,067.90 and 20,791

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Solution

The fourth proportional to 38,455, 53,067.90 and 20,791 is: 28,691.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,455 : 53,067.90 = 20,791 : x
  2. Step 2: Convert to fraction form
    38,455/53,067.90 = 20,791/x
  3. Step 3: Cross multiply
    38,455x = 53,067.90 × 20,791
  4. Step 4: Simplify right side
    38,455x = 1,103,334,708.90
  5. Step 5: Solve for x
    x = 1,103,334,708.90/38,455
  6. Step 6: Final answer
    x = 28,691.58

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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.