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Finding the Fourth Proportional to 427.20, 640.56 and 183.68

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Solution

The fourth proportional to 427.20, 640.56 and 183.68 is: 275.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.20 : 640.56 = 183.68 : x
  2. Step 2: Convert to fraction form
    427.20/640.56 = 183.68/x
  3. Step 3: Cross multiply
    427.20x = 640.56 × 183.68
  4. Step 4: Simplify right side
    427.20x = 117,658.06
  5. Step 5: Solve for x
    x = 117,658.06/427.20
  6. Step 6: Final answer
    x = 275.42

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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.