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Finding the Fourth Proportional to 397.76, 549.60 and 328.64

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Solution

The fourth proportional to 397.76, 549.60 and 328.64 is: 454.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.76 : 549.60 = 328.64 : x
  2. Step 2: Convert to fraction form
    397.76/549.60 = 328.64/x
  3. Step 3: Cross multiply
    397.76x = 549.60 × 328.64
  4. Step 4: Simplify right side
    397.76x = 180,620.54
  5. Step 5: Solve for x
    x = 180,620.54/397.76
  6. Step 6: Final answer
    x = 454.09

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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.