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Finding the Fourth Proportional to 379.12, 568.36 and 135.81

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Solution

The fourth proportional to 379.12, 568.36 and 135.81 is: 203.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.12 : 568.36 = 135.81 : x
  2. Step 2: Convert to fraction form
    379.12/568.36 = 135.81/x
  3. Step 3: Cross multiply
    379.12x = 568.36 × 135.81
  4. Step 4: Simplify right side
    379.12x = 77,188.97
  5. Step 5: Solve for x
    x = 77,188.97/379.12
  6. Step 6: Final answer
    x = 203.60

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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.