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Finding the Fourth Proportional to 290.97, 401.60 and 172.91

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Solution

The fourth proportional to 290.97, 401.60 and 172.91 is: 238.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.97 : 401.60 = 172.91 : x
  2. Step 2: Convert to fraction form
    290.97/401.60 = 172.91/x
  3. Step 3: Cross multiply
    290.97x = 401.60 × 172.91
  4. Step 4: Simplify right side
    290.97x = 69,437.78
  5. Step 5: Solve for x
    x = 69,437.78/290.97
  6. Step 6: Final answer
    x = 238.64

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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.