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Finding the Fourth Proportional to 383.31, 528.97 and 208.66

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Solution

The fourth proportional to 383.31, 528.97 and 208.66 is: 287.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.31 : 528.97 = 208.66 : x
  2. Step 2: Convert to fraction form
    383.31/528.97 = 208.66/x
  3. Step 3: Cross multiply
    383.31x = 528.97 × 208.66
  4. Step 4: Simplify right side
    383.31x = 110,374.08
  5. Step 5: Solve for x
    x = 110,374.08/383.31
  6. Step 6: Final answer
    x = 287.95

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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.