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Finding the Fourth Proportional to 309.72, 427.28 and 185.32

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Solution

The fourth proportional to 309.72, 427.28 and 185.32 is: 255.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.72 : 427.28 = 185.32 : x
  2. Step 2: Convert to fraction form
    309.72/427.28 = 185.32/x
  3. Step 3: Cross multiply
    309.72x = 427.28 × 185.32
  4. Step 4: Simplify right side
    309.72x = 79,183.53
  5. Step 5: Solve for x
    x = 79,183.53/309.72
  6. Step 6: Final answer
    x = 255.66

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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.