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Finding the Fourth Proportional to 18,959.78, 28,427.50 and 7,874.12

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Solution

The fourth proportional to 18,959.78, 28,427.50 and 7,874.12 is: 11,806.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,959.78 : 28,427.50 = 7,874.12 : x
  2. Step 2: Convert to fraction form
    18,959.78/28,427.50 = 7,874.12/x
  3. Step 3: Cross multiply
    18,959.78x = 28,427.50 × 7,874.12
  4. Step 4: Simplify right side
    18,959.78x = 223,841,546.30
  5. Step 5: Solve for x
    x = 223,841,546.30/18,959.78
  6. Step 6: Final answer
    x = 11,806.13

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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.