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Finding the Fourth Proportional to 38,978.62, 53,790.51 and 21,073.77

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Solution

The fourth proportional to 38,978.62, 53,790.51 and 21,073.77 is: 29,081.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,978.62 : 53,790.51 = 21,073.77 : x
  2. Step 2: Convert to fraction form
    38,978.62/53,790.51 = 21,073.77/x
  3. Step 3: Cross multiply
    38,978.62x = 53,790.51 × 21,073.77
  4. Step 4: Simplify right side
    38,978.62x = 1,133,568,914.95
  5. Step 5: Solve for x
    x = 1,133,568,914.95/38,978.62
  6. Step 6: Final answer
    x = 29,081.81

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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.