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Finding the Fourth Proportional to 27,978.09, 38,609.78 and 15,402.75

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Solution

The fourth proportional to 27,978.09, 38,609.78 and 15,402.75 is: 21,255.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,978.09 : 38,609.78 = 15,402.75 : x
  2. Step 2: Convert to fraction form
    27,978.09/38,609.78 = 15,402.75/x
  3. Step 3: Cross multiply
    27,978.09x = 38,609.78 × 15,402.75
  4. Step 4: Simplify right side
    27,978.09x = 594,696,711.88
  5. Step 5: Solve for x
    x = 594,696,711.88/27,978.09
  6. Step 6: Final answer
    x = 21,255.80

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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.