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Finding the Fourth Proportional to 312.31, 468.50 and 255.02

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Solution

The fourth proportional to 312.31, 468.50 and 255.02 is: 382.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.31 : 468.50 = 255.02 : x
  2. Step 2: Convert to fraction form
    312.31/468.50 = 255.02/x
  3. Step 3: Cross multiply
    312.31x = 468.50 × 255.02
  4. Step 4: Simplify right side
    312.31x = 119,476.87
  5. Step 5: Solve for x
    x = 119,476.87/312.31
  6. Step 6: Final answer
    x = 382.56

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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.