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Finding the Fourth Proportional to 262.20, 392.90 and 231.82

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Solution

The fourth proportional to 262.20, 392.90 and 231.82 is: 347.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.20 : 392.90 = 231.82 : x
  2. Step 2: Convert to fraction form
    262.20/392.90 = 231.82/x
  3. Step 3: Cross multiply
    262.20x = 392.90 × 231.82
  4. Step 4: Simplify right side
    262.20x = 91,082.08
  5. Step 5: Solve for x
    x = 91,082.08/262.20
  6. Step 6: Final answer
    x = 347.38

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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.