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Finding the Fourth Proportional to 394.29, 590.72 and 220.50

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Solution

The fourth proportional to 394.29, 590.72 and 220.50 is: 330.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.29 : 590.72 = 220.50 : x
  2. Step 2: Convert to fraction form
    394.29/590.72 = 220.50/x
  3. Step 3: Cross multiply
    394.29x = 590.72 × 220.50
  4. Step 4: Simplify right side
    394.29x = 130,252.66
  5. Step 5: Solve for x
    x = 130,252.66/394.29
  6. Step 6: Final answer
    x = 330.35

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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.