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Finding the Fourth Proportional to 10,611.32, 15,921.05 and 3,951.90

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Solution

The fourth proportional to 10,611.32, 15,921.05 and 3,951.90 is: 5,929.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,611.32 : 15,921.05 = 3,951.90 : x
  2. Step 2: Convert to fraction form
    10,611.32/15,921.05 = 3,951.90/x
  3. Step 3: Cross multiply
    10,611.32x = 15,921.05 × 3,951.90
  4. Step 4: Simplify right side
    10,611.32x = 62,918,377.74
  5. Step 5: Solve for x
    x = 62,918,377.74/10,611.32
  6. Step 6: Final answer
    x = 5,929.37

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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.