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Finding the Fourth Proportional to 313.62, 432.21 and 251.65

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Solution

The fourth proportional to 313.62, 432.21 and 251.65 is: 346.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.62 : 432.21 = 251.65 : x
  2. Step 2: Convert to fraction form
    313.62/432.21 = 251.65/x
  3. Step 3: Cross multiply
    313.62x = 432.21 × 251.65
  4. Step 4: Simplify right side
    313.62x = 108,765.65
  5. Step 5: Solve for x
    x = 108,765.65/313.62
  6. Step 6: Final answer
    x = 346.81

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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.