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Finding the Fourth Proportional to 393.74, 590.08 and 208.60

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Solution

The fourth proportional to 393.74, 590.08 and 208.60 is: 312.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.74 : 590.08 = 208.60 : x
  2. Step 2: Convert to fraction form
    393.74/590.08 = 208.60/x
  3. Step 3: Cross multiply
    393.74x = 590.08 × 208.60
  4. Step 4: Simplify right side
    393.74x = 123,090.74
  5. Step 5: Solve for x
    x = 123,090.74/393.74
  6. Step 6: Final answer
    x = 312.62

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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.