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Finding the Fourth Proportional to 395.63, 591.38 and 279.30

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Solution

The fourth proportional to 395.63, 591.38 and 279.30 is: 417.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.63 : 591.38 = 279.30 : x
  2. Step 2: Convert to fraction form
    395.63/591.38 = 279.30/x
  3. Step 3: Cross multiply
    395.63x = 591.38 × 279.30
  4. Step 4: Simplify right side
    395.63x = 165,171.04
  5. Step 5: Solve for x
    x = 165,171.04/395.63
  6. Step 6: Final answer
    x = 417.49

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.