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Finding the Fourth Proportional to 270.64, 405.43 and 212.22

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Solution

The fourth proportional to 270.64, 405.43 and 212.22 is: 317.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.64 : 405.43 = 212.22 : x
  2. Step 2: Convert to fraction form
    270.64/405.43 = 212.22/x
  3. Step 3: Cross multiply
    270.64x = 405.43 × 212.22
  4. Step 4: Simplify right side
    270.64x = 86,040.35
  5. Step 5: Solve for x
    x = 86,040.35/270.64
  6. Step 6: Final answer
    x = 317.91

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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.