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Finding the Fourth Proportional to 298.61, 447.55 and 220.40

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Solution

The fourth proportional to 298.61, 447.55 and 220.40 is: 330.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.61 : 447.55 = 220.40 : x
  2. Step 2: Convert to fraction form
    298.61/447.55 = 220.40/x
  3. Step 3: Cross multiply
    298.61x = 447.55 × 220.40
  4. Step 4: Simplify right side
    298.61x = 98,640.02
  5. Step 5: Solve for x
    x = 98,640.02/298.61
  6. Step 6: Final answer
    x = 330.33

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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.