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Finding the Fourth Proportional to 711.72, 1,067.16 and 630.72

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Solution

The fourth proportional to 711.72, 1,067.16 and 630.72 is: 945.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.72 : 1,067.16 = 630.72 : x
  2. Step 2: Convert to fraction form
    711.72/1,067.16 = 630.72/x
  3. Step 3: Cross multiply
    711.72x = 1,067.16 × 630.72
  4. Step 4: Simplify right side
    711.72x = 673,079.16
  5. Step 5: Solve for x
    x = 673,079.16/711.72
  6. Step 6: Final answer
    x = 945.71

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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.