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Finding the Fourth Proportional to 491.28, 678 and 270.27

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Solution

The fourth proportional to 491.28, 678 and 270.27 is: 372.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.28 : 678 = 270.27 : x
  2. Step 2: Convert to fraction form
    491.28/678 = 270.27/x
  3. Step 3: Cross multiply
    491.28x = 678 × 270.27
  4. Step 4: Simplify right side
    491.28x = 183,243.06
  5. Step 5: Solve for x
    x = 183,243.06/491.28
  6. Step 6: Final answer
    x = 372.99

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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.