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Finding the Fourth Proportional to 383.91, 575.34 and 210.31

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Solution

The fourth proportional to 383.91, 575.34 and 210.31 is: 315.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.91 : 575.34 = 210.31 : x
  2. Step 2: Convert to fraction form
    383.91/575.34 = 210.31/x
  3. Step 3: Cross multiply
    383.91x = 575.34 × 210.31
  4. Step 4: Simplify right side
    383.91x = 121,000.28
  5. Step 5: Solve for x
    x = 121,000.28/383.91
  6. Step 6: Final answer
    x = 315.18

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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.