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Finding the Fourth Proportional to 290.05, 400.28 and 172.00

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Solution

The fourth proportional to 290.05, 400.28 and 172.00 is: 237.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.05 : 400.28 = 172.00 : x
  2. Step 2: Convert to fraction form
    290.05/400.28 = 172.00/x
  3. Step 3: Cross multiply
    290.05x = 400.28 × 172.00
  4. Step 4: Simplify right side
    290.05x = 68,845.94
  5. Step 5: Solve for x
    x = 68,845.94/290.05
  6. Step 6: Final answer
    x = 237.36

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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.