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Finding the Fourth Proportional to 390.33, 585.09 and 225.59

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Solution

The fourth proportional to 390.33, 585.09 and 225.59 is: 338.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.33 : 585.09 = 225.59 : x
  2. Step 2: Convert to fraction form
    390.33/585.09 = 225.59/x
  3. Step 3: Cross multiply
    390.33x = 585.09 × 225.59
  4. Step 4: Simplify right side
    390.33x = 131,987.53
  5. Step 5: Solve for x
    x = 131,987.53/390.33
  6. Step 6: Final answer
    x = 338.14

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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.