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Finding the Fourth Proportional to 398.30, 549.41 and 258.36

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Solution

The fourth proportional to 398.30, 549.41 and 258.36 is: 356.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.30 : 549.41 = 258.36 : x
  2. Step 2: Convert to fraction form
    398.30/549.41 = 258.36/x
  3. Step 3: Cross multiply
    398.30x = 549.41 × 258.36
  4. Step 4: Simplify right side
    398.30x = 141,944.28
  5. Step 5: Solve for x
    x = 141,944.28/398.30
  6. Step 6: Final answer
    x = 356.38

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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.