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Finding the Fourth Proportional to 303.12, 418.35 and 220.20

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Solution

The fourth proportional to 303.12, 418.35 and 220.20 is: 303.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    303.12 : 418.35 = 220.20 : x
  2. Step 2: Convert to fraction form
    303.12/418.35 = 220.20/x
  3. Step 3: Cross multiply
    303.12x = 418.35 × 220.20
  4. Step 4: Simplify right side
    303.12x = 92,120.67
  5. Step 5: Solve for x
    x = 92,120.67/303.12
  6. Step 6: Final answer
    x = 303.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.