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Finding the Fourth Proportional to 15,172.69, 20,938.32 and 8,458.18

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Solution

The fourth proportional to 15,172.69, 20,938.32 and 8,458.18 is: 11,672.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,172.69 : 20,938.32 = 8,458.18 : x
  2. Step 2: Convert to fraction form
    15,172.69/20,938.32 = 8,458.18/x
  3. Step 3: Cross multiply
    15,172.69x = 20,938.32 × 8,458.18
  4. Step 4: Simplify right side
    15,172.69x = 177,099,974.77
  5. Step 5: Solve for x
    x = 177,099,974.77/15,172.69
  6. Step 6: Final answer
    x = 11,672.29

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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.