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Finding the Fourth Proportional to 251.95, 376.31 and 215.50

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Solution

The fourth proportional to 251.95, 376.31 and 215.50 is: 321.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.95 : 376.31 = 215.50 : x
  2. Step 2: Convert to fraction form
    251.95/376.31 = 215.50/x
  3. Step 3: Cross multiply
    251.95x = 376.31 × 215.50
  4. Step 4: Simplify right side
    251.95x = 81,094.81
  5. Step 5: Solve for x
    x = 81,094.81/251.95
  6. Step 6: Final answer
    x = 321.87

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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.