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Finding the Fourth Proportional to 3,109.32, 4,662.88 and 917.48

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Solution

The fourth proportional to 3,109.32, 4,662.88 and 917.48 is: 1,375.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,109.32 : 4,662.88 = 917.48 : x
  2. Step 2: Convert to fraction form
    3,109.32/4,662.88 = 917.48/x
  3. Step 3: Cross multiply
    3,109.32x = 4,662.88 × 917.48
  4. Step 4: Simplify right side
    3,109.32x = 4,278,099.14
  5. Step 5: Solve for x
    x = 4,278,099.14/3,109.32
  6. Step 6: Final answer
    x = 1,375.90

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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.