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Finding the Fourth Proportional to 18,915.12, 28,363.05 and 11,020.14

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Solution

The fourth proportional to 18,915.12, 28,363.05 and 11,020.14 is: 16,524.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,915.12 : 28,363.05 = 11,020.14 : x
  2. Step 2: Convert to fraction form
    18,915.12/28,363.05 = 11,020.14/x
  3. Step 3: Cross multiply
    18,915.12x = 28,363.05 × 11,020.14
  4. Step 4: Simplify right side
    18,915.12x = 312,564,781.83
  5. Step 5: Solve for x
    x = 312,564,781.83/18,915.12
  6. Step 6: Final answer
    x = 16,524.60

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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.