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Finding the Fourth Proportional to 651.66, 978.08 and 327.21

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Solution

The fourth proportional to 651.66, 978.08 and 327.21 is: 491.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.66 : 978.08 = 327.21 : x
  2. Step 2: Convert to fraction form
    651.66/978.08 = 327.21/x
  3. Step 3: Cross multiply
    651.66x = 978.08 × 327.21
  4. Step 4: Simplify right side
    651.66x = 320,037.56
  5. Step 5: Solve for x
    x = 320,037.56/651.66
  6. Step 6: Final answer
    x = 491.11

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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.