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Finding the Fourth Proportional to 290.21, 399.54 and 251.39

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Solution

The fourth proportional to 290.21, 399.54 and 251.39 is: 346.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.21 : 399.54 = 251.39 : x
  2. Step 2: Convert to fraction form
    290.21/399.54 = 251.39/x
  3. Step 3: Cross multiply
    290.21x = 399.54 × 251.39
  4. Step 4: Simplify right side
    290.21x = 100,440.36
  5. Step 5: Solve for x
    x = 100,440.36/290.21
  6. Step 6: Final answer
    x = 346.10

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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.