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Finding the Fourth Proportional to 398.60, 549.78 and 267.56

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Solution

The fourth proportional to 398.60, 549.78 and 267.56 is: 369.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.60 : 549.78 = 267.56 : x
  2. Step 2: Convert to fraction form
    398.60/549.78 = 267.56/x
  3. Step 3: Cross multiply
    398.60x = 549.78 × 267.56
  4. Step 4: Simplify right side
    398.60x = 147,099.14
  5. Step 5: Solve for x
    x = 147,099.14/398.60
  6. Step 6: Final answer
    x = 369.04

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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.