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Finding the Fourth Proportional to 39,092.78, 53,948.12 and 21,187.78

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Solution

The fourth proportional to 39,092.78, 53,948.12 and 21,187.78 is: 29,239.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,092.78 : 53,948.12 = 21,187.78 : x
  2. Step 2: Convert to fraction form
    39,092.78/53,948.12 = 21,187.78/x
  3. Step 3: Cross multiply
    39,092.78x = 53,948.12 × 21,187.78
  4. Step 4: Simplify right side
    39,092.78x = 1,143,040,716.76
  5. Step 5: Solve for x
    x = 1,143,040,716.76/39,092.78
  6. Step 6: Final answer
    x = 29,239.18

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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.