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Finding the Fourth Proportional to 193.30, 289.90 and 90.65

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Solution

The fourth proportional to 193.30, 289.90 and 90.65 is: 135.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.30 : 289.90 = 90.65 : x
  2. Step 2: Convert to fraction form
    193.30/289.90 = 90.65/x
  3. Step 3: Cross multiply
    193.30x = 289.90 × 90.65
  4. Step 4: Simplify right side
    193.30x = 26,278.98
  5. Step 5: Solve for x
    x = 26,278.98/193.30
  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.