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Finding the Fourth Proportional to 668.38, 1,002.56 and 181.43

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Solution

The fourth proportional to 668.38, 1,002.56 and 181.43 is: 272.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.38 : 1,002.56 = 181.43 : x
  2. Step 2: Convert to fraction form
    668.38/1,002.56 = 181.43/x
  3. Step 3: Cross multiply
    668.38x = 1,002.56 × 181.43
  4. Step 4: Simplify right side
    668.38x = 181,890.50
  5. Step 5: Solve for x
    x = 181,890.50/668.38
  6. Step 6: Final answer
    x = 272.14

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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.