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Finding the Fourth Proportional to 393.59, 590.59 and 220.15

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Solution

The fourth proportional to 393.59, 590.59 and 220.15 is: 330.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.59 : 590.59 = 220.15 : x
  2. Step 2: Convert to fraction form
    393.59/590.59 = 220.15/x
  3. Step 3: Cross multiply
    393.59x = 590.59 × 220.15
  4. Step 4: Simplify right side
    393.59x = 130,018.39
  5. Step 5: Solve for x
    x = 130,018.39/393.59
  6. Step 6: Final answer
    x = 330.34

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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.