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Finding the Fourth Proportional to 290.77, 436.22 and 136.87

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Solution

The fourth proportional to 290.77, 436.22 and 136.87 is: 205.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.77 : 436.22 = 136.87 : x
  2. Step 2: Convert to fraction form
    290.77/436.22 = 136.87/x
  3. Step 3: Cross multiply
    290.77x = 436.22 × 136.87
  4. Step 4: Simplify right side
    290.77x = 59,705.43
  5. Step 5: Solve for x
    x = 59,705.43/290.77
  6. Step 6: Final answer
    x = 205.34

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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.