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Finding the Fourth Proportional to 254.81, 381.05 and 189.86

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Solution

The fourth proportional to 254.81, 381.05 and 189.86 is: 283.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.81 : 381.05 = 189.86 : x
  2. Step 2: Convert to fraction form
    254.81/381.05 = 189.86/x
  3. Step 3: Cross multiply
    254.81x = 381.05 × 189.86
  4. Step 4: Simplify right side
    254.81x = 72,345.08
  5. Step 5: Solve for x
    x = 72,345.08/254.81
  6. Step 6: Final answer
    x = 283.91

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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.