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Finding the Fourth Proportional to 378.72, 568.12 and 135.28

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Solution

The fourth proportional to 378.72, 568.12 and 135.28 is: 202.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.72 : 568.12 = 135.28 : x
  2. Step 2: Convert to fraction form
    378.72/568.12 = 135.28/x
  3. Step 3: Cross multiply
    378.72x = 568.12 × 135.28
  4. Step 4: Simplify right side
    378.72x = 76,855.27
  5. Step 5: Solve for x
    x = 76,855.27/378.72
  6. Step 6: Final answer
    x = 202.93

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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.