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Finding the Fourth Proportional to 262.17, 392.90 and 108

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Solution

The fourth proportional to 262.17, 392.90 and 108 is: 161.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.17 : 392.90 = 108 : x
  2. Step 2: Convert to fraction form
    262.17/392.90 = 108/x
  3. Step 3: Cross multiply
    262.17x = 392.90 × 108
  4. Step 4: Simplify right side
    262.17x = 42,432.66
  5. Step 5: Solve for x
    x = 42,432.66/262.17
  6. Step 6: Final answer
    x = 161.85

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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.