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Finding the Fourth Proportional to 193.63, 290.52 and 71.91

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Solution

The fourth proportional to 193.63, 290.52 and 71.91 is: 107.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.63 : 290.52 = 71.91 : x
  2. Step 2: Convert to fraction form
    193.63/290.52 = 71.91/x
  3. Step 3: Cross multiply
    193.63x = 290.52 × 71.91
  4. Step 4: Simplify right side
    193.63x = 20,889.84
  5. Step 5: Solve for x
    x = 20,889.84/193.63
  6. Step 6: Final answer
    x = 107.89

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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.