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Finding the Fourth Proportional to 290.19, 400.40 and 172.17

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Solution

The fourth proportional to 290.19, 400.40 and 172.17 is: 237.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.19 : 400.40 = 172.17 : x
  2. Step 2: Convert to fraction form
    290.19/400.40 = 172.17/x
  3. Step 3: Cross multiply
    290.19x = 400.40 × 172.17
  4. Step 4: Simplify right side
    290.19x = 68,936.01
  5. Step 5: Solve for x
    x = 68,936.01/290.19
  6. Step 6: Final answer
    x = 237.55

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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.