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Finding the Fourth Proportional to 398.21, 549.45 and 232.38

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Solution

The fourth proportional to 398.21, 549.45 and 232.38 is: 320.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.21 : 549.45 = 232.38 : x
  2. Step 2: Convert to fraction form
    398.21/549.45 = 232.38/x
  3. Step 3: Cross multiply
    398.21x = 549.45 × 232.38
  4. Step 4: Simplify right side
    398.21x = 127,681.19
  5. Step 5: Solve for x
    x = 127,681.19/398.21
  6. Step 6: Final answer
    x = 320.64

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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.