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Finding the Fourth Proportional to 917.42, 1,375.73 and 300.78

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Solution

The fourth proportional to 917.42, 1,375.73 and 300.78 is: 451.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.42 : 1,375.73 = 300.78 : x
  2. Step 2: Convert to fraction form
    917.42/1,375.73 = 300.78/x
  3. Step 3: Cross multiply
    917.42x = 1,375.73 × 300.78
  4. Step 4: Simplify right side
    917.42x = 413,790.57
  5. Step 5: Solve for x
    x = 413,790.57/917.42
  6. Step 6: Final answer
    x = 451.04

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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.