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Finding the Fourth Proportional to 285.80, 427.92 and 208.36

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Solution

The fourth proportional to 285.80, 427.92 and 208.36 is: 311.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.80 : 427.92 = 208.36 : x
  2. Step 2: Convert to fraction form
    285.80/427.92 = 208.36/x
  3. Step 3: Cross multiply
    285.80x = 427.92 × 208.36
  4. Step 4: Simplify right side
    285.80x = 89,161.41
  5. Step 5: Solve for x
    x = 89,161.41/285.80
  6. Step 6: Final answer
    x = 311.97

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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.