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Finding the Fourth Proportional to 393.64, 591.30 and 239.65

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Solution

The fourth proportional to 393.64, 591.30 and 239.65 is: 359.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.64 : 591.30 = 239.65 : x
  2. Step 2: Convert to fraction form
    393.64/591.30 = 239.65/x
  3. Step 3: Cross multiply
    393.64x = 591.30 × 239.65
  4. Step 4: Simplify right side
    393.64x = 141,703.57
  5. Step 5: Solve for x
    x = 141,703.57/393.64
  6. Step 6: Final answer
    x = 359.98

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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.