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Finding the Fourth Proportional to 19,876.78, 29,775.36 and 11,974.90

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Solution

The fourth proportional to 19,876.78, 29,775.36 and 11,974.90 is: 17,938.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,876.78 : 29,775.36 = 11,974.90 : x
  2. Step 2: Convert to fraction form
    19,876.78/29,775.36 = 11,974.90/x
  3. Step 3: Cross multiply
    19,876.78x = 29,775.36 × 11,974.90
  4. Step 4: Simplify right side
    19,876.78x = 356,556,958.46
  5. Step 5: Solve for x
    x = 356,556,958.46/19,876.78
  6. Step 6: Final answer
    x = 17,938.37

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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.