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Finding the Fourth Proportional to 297.05, 409.91 and 172.70

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Solution

The fourth proportional to 297.05, 409.91 and 172.70 is: 238.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    297.05 : 409.91 = 172.70 : x
  2. Step 2: Convert to fraction form
    297.05/409.91 = 172.70/x
  3. Step 3: Cross multiply
    297.05x = 409.91 × 172.70
  4. Step 4: Simplify right side
    297.05x = 70,791.46
  5. Step 5: Solve for x
    x = 70,791.46/297.05
  6. Step 6: Final answer
    x = 238.32

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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.