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Finding the Fourth Proportional to 18,938.21, 28,407.30 and 7,251.42

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Solution

The fourth proportional to 18,938.21, 28,407.30 and 7,251.42 is: 10,877.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,938.21 : 28,407.30 = 7,251.42 : x
  2. Step 2: Convert to fraction form
    18,938.21/28,407.30 = 7,251.42/x
  3. Step 3: Cross multiply
    18,938.21x = 28,407.30 × 7,251.42
  4. Step 4: Simplify right side
    18,938.21x = 205,993,397.09
  5. Step 5: Solve for x
    x = 205,993,397.09/18,938.21
  6. Step 6: Final answer
    x = 10,877.13

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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.