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Finding the Fourth Proportional to 18,915.68, 28,335.17 and 8,769.81

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Solution

The fourth proportional to 18,915.68, 28,335.17 and 8,769.81 is: 13,136.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,915.68 : 28,335.17 = 8,769.81 : x
  2. Step 2: Convert to fraction form
    18,915.68/28,335.17 = 8,769.81/x
  3. Step 3: Cross multiply
    18,915.68x = 28,335.17 × 8,769.81
  4. Step 4: Simplify right side
    18,915.68x = 248,493,915.54
  5. Step 5: Solve for x
    x = 248,493,915.54/18,915.68
  6. Step 6: Final answer
    x = 13,136.93

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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.