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Finding the Fourth Proportional to 285.80, 427.89 and 213.98

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Solution

The fourth proportional to 285.80, 427.89 and 213.98 is: 320.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.80 : 427.89 = 213.98 : x
  2. Step 2: Convert to fraction form
    285.80/427.89 = 213.98/x
  3. Step 3: Cross multiply
    285.80x = 427.89 × 213.98
  4. Step 4: Simplify right side
    285.80x = 91,559.90
  5. Step 5: Solve for x
    x = 91,559.90/285.80
  6. Step 6: Final answer
    x = 320.36

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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.