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Finding the Fourth Proportional to 287.22, 396.40 and 162.90

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Solution

The fourth proportional to 287.22, 396.40 and 162.90 is: 224.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.22 : 396.40 = 162.90 : x
  2. Step 2: Convert to fraction form
    287.22/396.40 = 162.90/x
  3. Step 3: Cross multiply
    287.22x = 396.40 × 162.90
  4. Step 4: Simplify right side
    287.22x = 64,573.56
  5. Step 5: Solve for x
    x = 64,573.56/287.22
  6. Step 6: Final answer
    x = 224.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.