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Finding the Fourth Proportional to 18,974.01, 28,468.40 and 7,877.88

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Solution

The fourth proportional to 18,974.01, 28,468.40 and 7,877.88 is: 11,819.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,974.01 : 28,468.40 = 7,877.88 : x
  2. Step 2: Convert to fraction form
    18,974.01/28,468.40 = 7,877.88/x
  3. Step 3: Cross multiply
    18,974.01x = 28,468.40 × 7,877.88
  4. Step 4: Simplify right side
    18,974.01x = 224,270,638.99
  5. Step 5: Solve for x
    x = 224,270,638.99/18,974.01
  6. Step 6: Final answer
    x = 11,819.89

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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.