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Finding the Fourth Proportional to 651.72, 979.40 and 327.31

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Solution

The fourth proportional to 651.72, 979.40 and 327.31 is: 491.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.72 : 979.40 = 327.31 : x
  2. Step 2: Convert to fraction form
    651.72/979.40 = 327.31/x
  3. Step 3: Cross multiply
    651.72x = 979.40 × 327.31
  4. Step 4: Simplify right side
    651.72x = 320,565.78
  5. Step 5: Solve for x
    x = 320,565.78/651.72
  6. Step 6: Final answer
    x = 491.88

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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.