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Finding the Fourth Proportional to 309.56, 426.99 and 185.13

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Solution

The fourth proportional to 309.56, 426.99 and 185.13 is: 255.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.56 : 426.99 = 185.13 : x
  2. Step 2: Convert to fraction form
    309.56/426.99 = 185.13/x
  3. Step 3: Cross multiply
    309.56x = 426.99 × 185.13
  4. Step 4: Simplify right side
    309.56x = 79,048.66
  5. Step 5: Solve for x
    x = 79,048.66/309.56
  6. Step 6: Final answer
    x = 255.36

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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.