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Finding the Fourth Proportional to 398.08, 549.60 and 356.56

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Solution

The fourth proportional to 398.08, 549.60 and 356.56 is: 492.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.08 : 549.60 = 356.56 : x
  2. Step 2: Convert to fraction form
    398.08/549.60 = 356.56/x
  3. Step 3: Cross multiply
    398.08x = 549.60 × 356.56
  4. Step 4: Simplify right side
    398.08x = 195,965.38
  5. Step 5: Solve for x
    x = 195,965.38/398.08
  6. Step 6: Final answer
    x = 492.28

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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.