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Finding the Fourth Proportional to 290.44, 400.78 and 172.48

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Solution

The fourth proportional to 290.44, 400.78 and 172.48 is: 238.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.44 : 400.78 = 172.48 : x
  2. Step 2: Convert to fraction form
    290.44/400.78 = 172.48/x
  3. Step 3: Cross multiply
    290.44x = 400.78 × 172.48
  4. Step 4: Simplify right side
    290.44x = 69,126.53
  5. Step 5: Solve for x
    x = 69,126.53/290.44
  6. Step 6: Final answer
    x = 238.01

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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.