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Finding the Fourth Proportional to 393.20, 590.16 and 285.20

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Solution

The fourth proportional to 393.20, 590.16 and 285.20 is: 428.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.20 : 590.16 = 285.20 : x
  2. Step 2: Convert to fraction form
    393.20/590.16 = 285.20/x
  3. Step 3: Cross multiply
    393.20x = 590.16 × 285.20
  4. Step 4: Simplify right side
    393.20x = 168,313.63
  5. Step 5: Solve for x
    x = 168,313.63/393.20
  6. Step 6: Final answer
    x = 428.06

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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.