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Finding the Fourth Proportional to 38,759.78, 53,488.49 and 21,992.78

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Solution

The fourth proportional to 38,759.78, 53,488.49 and 21,992.78 is: 30,350.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,759.78 : 53,488.49 = 21,992.78 : x
  2. Step 2: Convert to fraction form
    38,759.78/53,488.49 = 21,992.78/x
  3. Step 3: Cross multiply
    38,759.78x = 53,488.49 × 21,992.78
  4. Step 4: Simplify right side
    38,759.78x = 1,176,360,616.86
  5. Step 5: Solve for x
    x = 1,176,360,616.86/38,759.78
  6. Step 6: Final answer
    x = 30,350.03

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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.