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Finding the Fourth Proportional to 20,639.52, 30,917.68 and 9,530.72

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Solution

The fourth proportional to 20,639.52, 30,917.68 and 9,530.72 is: 14,276.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,639.52 : 30,917.68 = 9,530.72 : x
  2. Step 2: Convert to fraction form
    20,639.52/30,917.68 = 9,530.72/x
  3. Step 3: Cross multiply
    20,639.52x = 30,917.68 × 9,530.72
  4. Step 4: Simplify right side
    20,639.52x = 294,667,751.13
  5. Step 5: Solve for x
    x = 294,667,751.13/20,639.52
  6. Step 6: Final answer
    x = 14,276.87

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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.