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Finding the Fourth Proportional to 27,978.78, 38,610.71 and 15,403.53

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Solution

The fourth proportional to 27,978.78, 38,610.71 and 15,403.53 is: 21,256.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,978.78 : 38,610.71 = 15,403.53 : x
  2. Step 2: Convert to fraction form
    27,978.78/38,610.71 = 15,403.53/x
  3. Step 3: Cross multiply
    27,978.78x = 38,610.71 × 15,403.53
  4. Step 4: Simplify right side
    27,978.78x = 594,741,152.79
  5. Step 5: Solve for x
    x = 594,741,152.79/27,978.78
  6. Step 6: Final answer
    x = 21,256.87

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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.