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Finding the Fourth Proportional to 375.28, 563 and 131.78

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Solution

The fourth proportional to 375.28, 563 and 131.78 is: 197.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    375.28 : 563 = 131.78 : x
  2. Step 2: Convert to fraction form
    375.28/563 = 131.78/x
  3. Step 3: Cross multiply
    375.28x = 563 × 131.78
  4. Step 4: Simplify right side
    375.28x = 74,192.14
  5. Step 5: Solve for x
    x = 74,192.14/375.28
  6. Step 6: Final answer
    x = 197.70

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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.