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Finding the Fourth Proportional to 667.63, 1,001.08 and 205.28

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Solution

The fourth proportional to 667.63, 1,001.08 and 205.28 is: 307.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.63 : 1,001.08 = 205.28 : x
  2. Step 2: Convert to fraction form
    667.63/1,001.08 = 205.28/x
  3. Step 3: Cross multiply
    667.63x = 1,001.08 × 205.28
  4. Step 4: Simplify right side
    667.63x = 205,506.92
  5. Step 5: Solve for x
    x = 205,506.92/667.63
  6. Step 6: Final answer
    x = 307.81

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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.