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Finding the Fourth Proportional to 262.12, 392.80 and 107.88

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Solution

The fourth proportional to 262.12, 392.80 and 107.88 is: 161.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.12 : 392.80 = 107.88 : x
  2. Step 2: Convert to fraction form
    262.12/392.80 = 107.88/x
  3. Step 3: Cross multiply
    262.12x = 392.80 × 107.88
  4. Step 4: Simplify right side
    262.12x = 42,375.26
  5. Step 5: Solve for x
    x = 42,375.26/262.12
  6. Step 6: Final answer
    x = 161.66

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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.