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Finding the Fourth Proportional to 303.36, 418.88 and 290.56

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Solution

The fourth proportional to 303.36, 418.88 and 290.56 is: 401.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    303.36 : 418.88 = 290.56 : x
  2. Step 2: Convert to fraction form
    303.36/418.88 = 290.56/x
  3. Step 3: Cross multiply
    303.36x = 418.88 × 290.56
  4. Step 4: Simplify right side
    303.36x = 121,709.77
  5. Step 5: Solve for x
    x = 121,709.77/303.36
  6. Step 6: Final answer
    x = 401.21

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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.