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Finding the Fourth Proportional to 20,397.54, 30,601.17 and 7,917.87

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Solution

The fourth proportional to 20,397.54, 30,601.17 and 7,917.87 is: 11,878.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,397.54 : 30,601.17 = 7,917.87 : x
  2. Step 2: Convert to fraction form
    20,397.54/30,601.17 = 7,917.87/x
  3. Step 3: Cross multiply
    20,397.54x = 30,601.17 × 7,917.87
  4. Step 4: Simplify right side
    20,397.54x = 242,296,085.91
  5. Step 5: Solve for x
    x = 242,296,085.91/20,397.54
  6. Step 6: Final answer
    x = 11,878.69

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1.5x scale

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.