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Finding the Fourth Proportional to 7,917.21, 10,920.98 and 5,228.44

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Solution

The fourth proportional to 7,917.21, 10,920.98 and 5,228.44 is: 7,212.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,917.21 : 10,920.98 = 5,228.44 : x
  2. Step 2: Convert to fraction form
    7,917.21/10,920.98 = 5,228.44/x
  3. Step 3: Cross multiply
    7,917.21x = 10,920.98 × 5,228.44
  4. Step 4: Simplify right side
    7,917.21x = 57,099,674.44
  5. Step 5: Solve for x
    x = 57,099,674.44/7,917.21
  6. Step 6: Final answer
    x = 7,212.10

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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.