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Finding the Fourth Proportional to 254.28, 381.38 and 71.64

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Solution

The fourth proportional to 254.28, 381.38 and 71.64 is: 107.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.28 : 381.38 = 71.64 : x
  2. Step 2: Convert to fraction form
    254.28/381.38 = 71.64/x
  3. Step 3: Cross multiply
    254.28x = 381.38 × 71.64
  4. Step 4: Simplify right side
    254.28x = 27,322.06
  5. Step 5: Solve for x
    x = 27,322.06/254.28
  6. Step 6: Final answer
    x = 107.45

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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.