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Finding the Fourth Proportional to 15,394.78, 21,243.99 and 8,680.42

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Solution

The fourth proportional to 15,394.78, 21,243.99 and 8,680.42 is: 11,978.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,394.78 : 21,243.99 = 8,680.42 : x
  2. Step 2: Convert to fraction form
    15,394.78/21,243.99 = 8,680.42/x
  3. Step 3: Cross multiply
    15,394.78x = 21,243.99 × 8,680.42
  4. Step 4: Simplify right side
    15,394.78x = 184,406,755.68
  5. Step 5: Solve for x
    x = 184,406,755.68/15,394.78
  6. Step 6: Final answer
    x = 11,978.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.