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Finding the Fourth Proportional to 289.89, 399.24 and 267.21

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Solution

The fourth proportional to 289.89, 399.24 and 267.21 is: 368.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.89 : 399.24 = 267.21 : x
  2. Step 2: Convert to fraction form
    289.89/399.24 = 267.21/x
  3. Step 3: Cross multiply
    289.89x = 399.24 × 267.21
  4. Step 4: Simplify right side
    289.89x = 106,680.92
  5. Step 5: Solve for x
    x = 106,680.92/289.89
  6. Step 6: Final answer
    x = 368.00

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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.