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Finding the Fourth Proportional to 193.65, 290.31 and 85.38

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Solution

The fourth proportional to 193.65, 290.31 and 85.38 is: 128.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.65 : 290.31 = 85.38 : x
  2. Step 2: Convert to fraction form
    193.65/290.31 = 85.38/x
  3. Step 3: Cross multiply
    193.65x = 290.31 × 85.38
  4. Step 4: Simplify right side
    193.65x = 24,786.67
  5. Step 5: Solve for x
    x = 24,786.67/193.65
  6. Step 6: Final answer
    x = 128.00

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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.