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Finding the Fourth Proportional to 254.60, 381.08 and 215.72

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Solution

The fourth proportional to 254.60, 381.08 and 215.72 is: 322.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.60 : 381.08 = 215.72 : x
  2. Step 2: Convert to fraction form
    254.60/381.08 = 215.72/x
  3. Step 3: Cross multiply
    254.60x = 381.08 × 215.72
  4. Step 4: Simplify right side
    254.60x = 82,205.21
  5. Step 5: Solve for x
    x = 82,205.21/254.60
  6. Step 6: Final answer
    x = 322.89

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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.