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Finding the Fourth Proportional to 309.66, 427.21 and 185.34

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Solution

The fourth proportional to 309.66, 427.21 and 185.34 is: 255.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.66 : 427.21 = 185.34 : x
  2. Step 2: Convert to fraction form
    309.66/427.21 = 185.34/x
  3. Step 3: Cross multiply
    309.66x = 427.21 × 185.34
  4. Step 4: Simplify right side
    309.66x = 79,179.10
  5. Step 5: Solve for x
    x = 79,179.10/309.66
  6. Step 6: Final answer
    x = 255.70

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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.