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Finding the Fourth Proportional to 309.55, 427.18 and 185.21

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Solution

The fourth proportional to 309.55, 427.18 and 185.21 is: 255.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.55 : 427.18 = 185.21 : x
  2. Step 2: Convert to fraction form
    309.55/427.18 = 185.21/x
  3. Step 3: Cross multiply
    309.55x = 427.18 × 185.21
  4. Step 4: Simplify right side
    309.55x = 79,118.01
  5. Step 5: Solve for x
    x = 79,118.01/309.55
  6. Step 6: Final answer
    x = 255.59

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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.