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Finding the Fourth Proportional to 254.42, 381.12 and 117.28

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Solution

The fourth proportional to 254.42, 381.12 and 117.28 is: 175.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.42 : 381.12 = 117.28 : x
  2. Step 2: Convert to fraction form
    254.42/381.12 = 117.28/x
  3. Step 3: Cross multiply
    254.42x = 381.12 × 117.28
  4. Step 4: Simplify right side
    254.42x = 44,695.85
  5. Step 5: Solve for x
    x = 44,695.85/254.42
  6. Step 6: Final answer
    x = 175.68

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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.