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Finding the Fourth Proportional to 331.40, 497.87 and 208.39

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Solution

The fourth proportional to 331.40, 497.87 and 208.39 is: 313.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.40 : 497.87 = 208.39 : x
  2. Step 2: Convert to fraction form
    331.40/497.87 = 208.39/x
  3. Step 3: Cross multiply
    331.40x = 497.87 × 208.39
  4. Step 4: Simplify right side
    331.40x = 103,751.13
  5. Step 5: Solve for x
    x = 103,751.13/331.40
  6. Step 6: Final answer
    x = 313.07

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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.