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Finding the Fourth Proportional to 193.75, 290.49 and 72

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Solution

The fourth proportional to 193.75, 290.49 and 72 is: 107.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.75 : 290.49 = 72 : x
  2. Step 2: Convert to fraction form
    193.75/290.49 = 72/x
  3. Step 3: Cross multiply
    193.75x = 290.49 × 72
  4. Step 4: Simplify right side
    193.75x = 20,915.28
  5. Step 5: Solve for x
    x = 20,915.28/193.75
  6. Step 6: Final answer
    x = 107.95

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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.