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Finding the Fourth Proportional to 331.05, 457.08 and 206.88

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Solution

The fourth proportional to 331.05, 457.08 and 206.88 is: 285.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.05 : 457.08 = 206.88 : x
  2. Step 2: Convert to fraction form
    331.05/457.08 = 206.88/x
  3. Step 3: Cross multiply
    331.05x = 457.08 × 206.88
  4. Step 4: Simplify right side
    331.05x = 94,560.71
  5. Step 5: Solve for x
    x = 94,560.71/331.05
  6. Step 6: Final answer
    x = 285.64

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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.