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Finding the Fourth Proportional to 270.19, 405.85 and 193.64

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Solution

The fourth proportional to 270.19, 405.85 and 193.64 is: 290.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.19 : 405.85 = 193.64 : x
  2. Step 2: Convert to fraction form
    270.19/405.85 = 193.64/x
  3. Step 3: Cross multiply
    270.19x = 405.85 × 193.64
  4. Step 4: Simplify right side
    270.19x = 78,588.79
  5. Step 5: Solve for x
    x = 78,588.79/270.19
  6. Step 6: Final answer
    x = 290.87

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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.