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Finding the Fourth Proportional to 390.22, 585 and 235.96

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Solution

The fourth proportional to 390.22, 585 and 235.96 is: 353.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.22 : 585 = 235.96 : x
  2. Step 2: Convert to fraction form
    390.22/585 = 235.96/x
  3. Step 3: Cross multiply
    390.22x = 585 × 235.96
  4. Step 4: Simplify right side
    390.22x = 138,036.60
  5. Step 5: Solve for x
    x = 138,036.60/390.22
  6. Step 6: Final answer
    x = 353.74

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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.