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Finding the Fourth Proportional to 331.02, 456.70 and 199.80

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Solution

The fourth proportional to 331.02, 456.70 and 199.80 is: 275.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.02 : 456.70 = 199.80 : x
  2. Step 2: Convert to fraction form
    331.02/456.70 = 199.80/x
  3. Step 3: Cross multiply
    331.02x = 456.70 × 199.80
  4. Step 4: Simplify right side
    331.02x = 91,248.66
  5. Step 5: Solve for x
    x = 91,248.66/331.02
  6. Step 6: Final answer
    x = 275.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.