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Finding the Fourth Proportional to 20,480.61, 30,719.48 and 11,687.97

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Solution

The fourth proportional to 20,480.61, 30,719.48 and 11,687.97 is: 17,531.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,480.61 : 30,719.48 = 11,687.97 : x
  2. Step 2: Convert to fraction form
    20,480.61/30,719.48 = 11,687.97/x
  3. Step 3: Cross multiply
    20,480.61x = 30,719.48 × 11,687.97
  4. Step 4: Simplify right side
    20,480.61x = 359,048,302.22
  5. Step 5: Solve for x
    x = 359,048,302.22/20,480.61
  6. Step 6: Final answer
    x = 17,531.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.