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Finding the Fourth Proportional to 383.22, 528.86 and 208.58

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Solution

The fourth proportional to 383.22, 528.86 and 208.58 is: 287.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.22 : 528.86 = 208.58 : x
  2. Step 2: Convert to fraction form
    383.22/528.86 = 208.58/x
  3. Step 3: Cross multiply
    383.22x = 528.86 × 208.58
  4. Step 4: Simplify right side
    383.22x = 110,305.93
  5. Step 5: Solve for x
    x = 110,305.93/383.22
  6. Step 6: Final answer
    x = 287.84

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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.