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Finding the Fourth Proportional to 15,447.89, 21,318 and 8,374.29

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Solution

The fourth proportional to 15,447.89, 21,318 and 8,374.29 is: 11,556.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,447.89 : 21,318 = 8,374.29 : x
  2. Step 2: Convert to fraction form
    15,447.89/21,318 = 8,374.29/x
  3. Step 3: Cross multiply
    15,447.89x = 21,318 × 8,374.29
  4. Step 4: Simplify right side
    15,447.89x = 178,523,114.22
  5. Step 5: Solve for x
    x = 178,523,114.22/15,447.89
  6. Step 6: Final answer
    x = 11,556.48

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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.