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Finding the Fourth Proportional to 451.78, 623.45 and 255.29

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Solution

The fourth proportional to 451.78, 623.45 and 255.29 is: 352.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.78 : 623.45 = 255.29 : x
  2. Step 2: Convert to fraction form
    451.78/623.45 = 255.29/x
  3. Step 3: Cross multiply
    451.78x = 623.45 × 255.29
  4. Step 4: Simplify right side
    451.78x = 159,160.83
  5. Step 5: Solve for x
    x = 159,160.83/451.78
  6. Step 6: Final answer
    x = 352.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.