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Finding the Fourth Proportional to 20,621.30, 30,921.60 and 10,092.11

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Solution

The fourth proportional to 20,621.30, 30,921.60 and 10,092.11 is: 15,133.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,621.30 : 30,921.60 = 10,092.11 : x
  2. Step 2: Convert to fraction form
    20,621.30/30,921.60 = 10,092.11/x
  3. Step 3: Cross multiply
    20,621.30x = 30,921.60 × 10,092.11
  4. Step 4: Simplify right side
    20,621.30x = 312,064,188.58
  5. Step 5: Solve for x
    x = 312,064,188.58/20,621.30
  6. Step 6: Final answer
    x = 15,133.10

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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.