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Finding the Fourth Proportional to 331.65, 498.24 and 208.64

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Solution

The fourth proportional to 331.65, 498.24 and 208.64 is: 313.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.65 : 498.24 = 208.64 : x
  2. Step 2: Convert to fraction form
    331.65/498.24 = 208.64/x
  3. Step 3: Cross multiply
    331.65x = 498.24 × 208.64
  4. Step 4: Simplify right side
    331.65x = 103,952.79
  5. Step 5: Solve for x
    x = 103,952.79/331.65
  6. Step 6: Final answer
    x = 313.44

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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.