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Finding the Fourth Proportional to 8,636.30, 11,917.17 and 5,279.90

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Solution

The fourth proportional to 8,636.30, 11,917.17 and 5,279.90 is: 7,285.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,636.30 : 11,917.17 = 5,279.90 : x
  2. Step 2: Convert to fraction form
    8,636.30/11,917.17 = 5,279.90/x
  3. Step 3: Cross multiply
    8,636.30x = 11,917.17 × 5,279.90
  4. Step 4: Simplify right side
    8,636.30x = 62,921,465.88
  5. Step 5: Solve for x
    x = 62,921,465.88/8,636.30
  6. Step 6: Final answer
    x = 7,285.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.