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Finding the Fourth Proportional to 21,915.66, 30,243.87 and 11,979.66

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Solution

The fourth proportional to 21,915.66, 30,243.87 and 11,979.66 is: 16,532.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,915.66 : 30,243.87 = 11,979.66 : x
  2. Step 2: Convert to fraction form
    21,915.66/30,243.87 = 11,979.66/x
  3. Step 3: Cross multiply
    21,915.66x = 30,243.87 × 11,979.66
  4. Step 4: Simplify right side
    21,915.66x = 362,311,279.68
  5. Step 5: Solve for x
    x = 362,311,279.68/21,915.66
  6. Step 6: Final answer
    x = 16,532.07

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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.