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Finding the Fourth Proportional to 287.89, 397.29 and 163.55

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Solution

The fourth proportional to 287.89, 397.29 and 163.55 is: 225.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.89 : 397.29 = 163.55 : x
  2. Step 2: Convert to fraction form
    287.89/397.29 = 163.55/x
  3. Step 3: Cross multiply
    287.89x = 397.29 × 163.55
  4. Step 4: Simplify right side
    287.89x = 64,974.79
  5. Step 5: Solve for x
    x = 64,974.79/287.89
  6. Step 6: Final answer
    x = 225.70

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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.