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Finding the Fourth Proportional to 254.18, 380.72 and 215.57

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Solution

The fourth proportional to 254.18, 380.72 and 215.57 is: 322.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.18 : 380.72 = 215.57 : x
  2. Step 2: Convert to fraction form
    254.18/380.72 = 215.57/x
  3. Step 3: Cross multiply
    254.18x = 380.72 × 215.57
  4. Step 4: Simplify right side
    254.18x = 82,070.45
  5. Step 5: Solve for x
    x = 82,070.45/254.18
  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.