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Finding the Fourth Proportional to 289.21, 399.13 and 172.75

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Solution

The fourth proportional to 289.21, 399.13 and 172.75 is: 238.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.21 : 399.13 = 172.75 : x
  2. Step 2: Convert to fraction form
    289.21/399.13 = 172.75/x
  3. Step 3: Cross multiply
    289.21x = 399.13 × 172.75
  4. Step 4: Simplify right side
    289.21x = 68,949.71
  5. Step 5: Solve for x
    x = 68,949.71/289.21
  6. Step 6: Final answer
    x = 238.41

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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.