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Finding the Fourth Proportional to 18,915.13, 28,347.18 and 7,221.97

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Solution

The fourth proportional to 18,915.13, 28,347.18 and 7,221.97 is: 10,823.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,915.13 : 28,347.18 = 7,221.97 : x
  2. Step 2: Convert to fraction form
    18,915.13/28,347.18 = 7,221.97/x
  3. Step 3: Cross multiply
    18,915.13x = 28,347.18 × 7,221.97
  4. Step 4: Simplify right side
    18,915.13x = 204,722,447.43
  5. Step 5: Solve for x
    x = 204,722,447.43/18,915.13
  6. Step 6: Final answer
    x = 10,823.21

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1.5x scale

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.