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Finding the Fourth Proportional to 427.12, 640.72 and 153.24

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Solution

The fourth proportional to 427.12, 640.72 and 153.24 is: 229.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.12 : 640.72 = 153.24 : x
  2. Step 2: Convert to fraction form
    427.12/640.72 = 153.24/x
  3. Step 3: Cross multiply
    427.12x = 640.72 × 153.24
  4. Step 4: Simplify right side
    427.12x = 98,183.93
  5. Step 5: Solve for x
    x = 98,183.93/427.12
  6. Step 6: Final answer
    x = 229.87

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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.