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Finding the Fourth Proportional to 20,487.79, 30,732.77 and 11,731.15

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Solution

The fourth proportional to 20,487.79, 30,732.77 and 11,731.15 is: 17,597.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,487.79 : 30,732.77 = 11,731.15 : x
  2. Step 2: Convert to fraction form
    20,487.79/30,732.77 = 11,731.15/x
  3. Step 3: Cross multiply
    20,487.79x = 30,732.77 × 11,731.15
  4. Step 4: Simplify right side
    20,487.79x = 360,530,734.79
  5. Step 5: Solve for x
    x = 360,530,734.79/20,487.79
  6. Step 6: Final answer
    x = 17,597.35

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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.