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Finding the Fourth Proportional to 393.64, 590.21 and 188.21

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Solution

The fourth proportional to 393.64, 590.21 and 188.21 is: 282.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.64 : 590.21 = 188.21 : x
  2. Step 2: Convert to fraction form
    393.64/590.21 = 188.21/x
  3. Step 3: Cross multiply
    393.64x = 590.21 × 188.21
  4. Step 4: Simplify right side
    393.64x = 111,080.24
  5. Step 5: Solve for x
    x = 111,080.24/393.64
  6. Step 6: Final answer
    x = 282.19

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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.