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Finding the Fourth Proportional to 656.31, 984.86 and 331.71

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Solution

The fourth proportional to 656.31, 984.86 and 331.71 is: 497.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.31 : 984.86 = 331.71 : x
  2. Step 2: Convert to fraction form
    656.31/984.86 = 331.71/x
  3. Step 3: Cross multiply
    656.31x = 984.86 × 331.71
  4. Step 4: Simplify right side
    656.31x = 326,686.25
  5. Step 5: Solve for x
    x = 326,686.25/656.31
  6. Step 6: Final answer
    x = 497.76

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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.