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Finding the Fourth Proportional to 251.88, 376.14 and 215.40

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Solution

The fourth proportional to 251.88, 376.14 and 215.40 is: 321.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.88 : 376.14 = 215.40 : x
  2. Step 2: Convert to fraction form
    251.88/376.14 = 215.40/x
  3. Step 3: Cross multiply
    251.88x = 376.14 × 215.40
  4. Step 4: Simplify right side
    251.88x = 81,020.56
  5. Step 5: Solve for x
    x = 81,020.56/251.88
  6. Step 6: Final answer
    x = 321.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.