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Finding the Fourth Proportional to 298.61, 448.22 and 217.20

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Solution

The fourth proportional to 298.61, 448.22 and 217.20 is: 326.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.61 : 448.22 = 217.20 : x
  2. Step 2: Convert to fraction form
    298.61/448.22 = 217.20/x
  3. Step 3: Cross multiply
    298.61x = 448.22 × 217.20
  4. Step 4: Simplify right side
    298.61x = 97,353.38
  5. Step 5: Solve for x
    x = 97,353.38/298.61
  6. Step 6: Final answer
    x = 326.02

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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.