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Finding the Fourth Proportional to 290.68, 436.22 and 128.36

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Solution

The fourth proportional to 290.68, 436.22 and 128.36 is: 192.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.68 : 436.22 = 128.36 : x
  2. Step 2: Convert to fraction form
    290.68/436.22 = 128.36/x
  3. Step 3: Cross multiply
    290.68x = 436.22 × 128.36
  4. Step 4: Simplify right side
    290.68x = 55,993.20
  5. Step 5: Solve for x
    x = 55,993.20/290.68
  6. Step 6: Final answer
    x = 192.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.