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Finding the Fourth Proportional to 398.49, 549.90 and 232.77

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Solution

The fourth proportional to 398.49, 549.90 and 232.77 is: 321.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.49 : 549.90 = 232.77 : x
  2. Step 2: Convert to fraction form
    398.49/549.90 = 232.77/x
  3. Step 3: Cross multiply
    398.49x = 549.90 × 232.77
  4. Step 4: Simplify right side
    398.49x = 128,000.22
  5. Step 5: Solve for x
    x = 128,000.22/398.49
  6. Step 6: Final answer
    x = 321.21

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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.