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Finding the Fourth Proportional to 193.25, 289.94 and 90.61

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Solution

The fourth proportional to 193.25, 289.94 and 90.61 is: 135.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.25 : 289.94 = 90.61 : x
  2. Step 2: Convert to fraction form
    193.25/289.94 = 90.61/x
  3. Step 3: Cross multiply
    193.25x = 289.94 × 90.61
  4. Step 4: Simplify right side
    193.25x = 26,271.46
  5. Step 5: Solve for x
    x = 26,271.46/193.25
  6. Step 6: Final answer
    x = 135.95

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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.