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Finding the Fourth Proportional to 254.32, 381.21 and 145.91

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Solution

The fourth proportional to 254.32, 381.21 and 145.91 is: 218.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.32 : 381.21 = 145.91 : x
  2. Step 2: Convert to fraction form
    254.32/381.21 = 145.91/x
  3. Step 3: Cross multiply
    254.32x = 381.21 × 145.91
  4. Step 4: Simplify right side
    254.32x = 55,622.76
  5. Step 5: Solve for x
    x = 55,622.76/254.32
  6. Step 6: Final answer
    x = 218.71

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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.