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Finding the Fourth Proportional to 383.79, 575.70 and 311.43

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Solution

The fourth proportional to 383.79, 575.70 and 311.43 is: 467.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.79 : 575.70 = 311.43 : x
  2. Step 2: Convert to fraction form
    383.79/575.70 = 311.43/x
  3. Step 3: Cross multiply
    383.79x = 575.70 × 311.43
  4. Step 4: Simplify right side
    383.79x = 179,290.25
  5. Step 5: Solve for x
    x = 179,290.25/383.79
  6. Step 6: Final answer
    x = 467.16

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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.