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Finding the Fourth Proportional to 393.75, 590.36 and 239.72

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Solution

The fourth proportional to 393.75, 590.36 and 239.72 is: 359.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.75 : 590.36 = 239.72 : x
  2. Step 2: Convert to fraction form
    393.75/590.36 = 239.72/x
  3. Step 3: Cross multiply
    393.75x = 590.36 × 239.72
  4. Step 4: Simplify right side
    393.75x = 141,516.95
  5. Step 5: Solve for x
    x = 141,516.95/393.75
  6. Step 6: Final answer
    x = 359.41

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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.