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Finding the Fourth Proportional to 383.11, 528.69 and 208.45

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Solution

The fourth proportional to 383.11, 528.69 and 208.45 is: 287.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.11 : 528.69 = 208.45 : x
  2. Step 2: Convert to fraction form
    383.11/528.69 = 208.45/x
  3. Step 3: Cross multiply
    383.11x = 528.69 × 208.45
  4. Step 4: Simplify right side
    383.11x = 110,205.43
  5. Step 5: Solve for x
    x = 110,205.43/383.11
  6. Step 6: Final answer
    x = 287.66

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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.