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Finding the Fourth Proportional to 378.76, 568.04 and 115.16

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Solution

The fourth proportional to 378.76, 568.04 and 115.16 is: 172.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.76 : 568.04 = 115.16 : x
  2. Step 2: Convert to fraction form
    378.76/568.04 = 115.16/x
  3. Step 3: Cross multiply
    378.76x = 568.04 × 115.16
  4. Step 4: Simplify right side
    378.76x = 65,415.49
  5. Step 5: Solve for x
    x = 65,415.49/378.76
  6. Step 6: Final answer
    x = 172.71

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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.