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Finding the Fourth Proportional to 451.78, 678.68 and 342.43

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Solution

The fourth proportional to 451.78, 678.68 and 342.43 is: 514.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.78 : 678.68 = 342.43 : x
  2. Step 2: Convert to fraction form
    451.78/678.68 = 342.43/x
  3. Step 3: Cross multiply
    451.78x = 678.68 × 342.43
  4. Step 4: Simplify right side
    451.78x = 232,398.27
  5. Step 5: Solve for x
    x = 232,398.27/451.78
  6. Step 6: Final answer
    x = 514.41

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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.