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Finding the Fourth Proportional to 451.92, 678 and 127.30

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Solution

The fourth proportional to 451.92, 678 and 127.30 is: 190.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.92 : 678 = 127.30 : x
  2. Step 2: Convert to fraction form
    451.92/678 = 127.30/x
  3. Step 3: Cross multiply
    451.92x = 678 × 127.30
  4. Step 4: Simplify right side
    451.92x = 86,309.40
  5. Step 5: Solve for x
    x = 86,309.40/451.92
  6. Step 6: Final answer
    x = 190.98

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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.