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Finding the Fourth Proportional to 711.05, 1,066.32 and 272.42

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Solution

The fourth proportional to 711.05, 1,066.32 and 272.42 is: 408.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.05 : 1,066.32 = 272.42 : x
  2. Step 2: Convert to fraction form
    711.05/1,066.32 = 272.42/x
  3. Step 3: Cross multiply
    711.05x = 1,066.32 × 272.42
  4. Step 4: Simplify right side
    711.05x = 290,481.56
  5. Step 5: Solve for x
    x = 290,481.56/711.05
  6. Step 6: Final answer
    x = 408.53

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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.