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Finding the Fourth Proportional to 398.07, 549.35 and 218.63

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Solution

The fourth proportional to 398.07, 549.35 and 218.63 is: 301.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.07 : 549.35 = 218.63 : x
  2. Step 2: Convert to fraction form
    398.07/549.35 = 218.63/x
  3. Step 3: Cross multiply
    398.07x = 549.35 × 218.63
  4. Step 4: Simplify right side
    398.07x = 120,104.39
  5. Step 5: Solve for x
    x = 120,104.39/398.07
  6. Step 6: Final answer
    x = 301.72

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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.