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Finding the Fourth Proportional to 27,978.91, 38,610.94 and 15,403.66

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Solution

The fourth proportional to 27,978.91, 38,610.94 and 15,403.66 is: 21,257.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,978.91 : 38,610.94 = 15,403.66 : x
  2. Step 2: Convert to fraction form
    27,978.91/38,610.94 = 15,403.66/x
  3. Step 3: Cross multiply
    27,978.91x = 38,610.94 × 15,403.66
  4. Step 4: Simplify right side
    27,978.91x = 594,749,792.04
  5. Step 5: Solve for x
    x = 594,749,792.04/27,978.91
  6. Step 6: Final answer
    x = 21,257.08

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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.