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Finding the Fourth Proportional to 313.20, 469.85 and 107.78

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Solution

The fourth proportional to 313.20, 469.85 and 107.78 is: 161.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.20 : 469.85 = 107.78 : x
  2. Step 2: Convert to fraction form
    313.20/469.85 = 107.78/x
  3. Step 3: Cross multiply
    313.20x = 469.85 × 107.78
  4. Step 4: Simplify right side
    313.20x = 50,640.43
  5. Step 5: Solve for x
    x = 50,640.43/313.20
  6. Step 6: Final answer
    x = 161.69

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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.