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Finding the Fourth Proportional to 20,485.31, 30,731.21 and 7,337.39

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Solution

The fourth proportional to 20,485.31, 30,731.21 and 7,337.39 is: 11,007.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,485.31 : 30,731.21 = 7,337.39 : x
  2. Step 2: Convert to fraction form
    20,485.31/30,731.21 = 7,337.39/x
  3. Step 3: Cross multiply
    20,485.31x = 30,731.21 × 7,337.39
  4. Step 4: Simplify right side
    20,485.31x = 225,486,872.94
  5. Step 5: Solve for x
    x = 225,486,872.94/20,485.31
  6. Step 6: Final answer
    x = 11,007.25

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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.