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Finding the Fourth Proportional to 7,279.84, 10,917.44 and 3,815.20

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Solution

The fourth proportional to 7,279.84, 10,917.44 and 3,815.20 is: 5,721.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,279.84 : 10,917.44 = 3,815.20 : x
  2. Step 2: Convert to fraction form
    7,279.84/10,917.44 = 3,815.20/x
  3. Step 3: Cross multiply
    7,279.84x = 10,917.44 × 3,815.20
  4. Step 4: Simplify right side
    7,279.84x = 41,652,217.09
  5. Step 5: Solve for x
    x = 41,652,217.09/7,279.84
  6. Step 6: Final answer
    x = 5,721.58

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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.