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Finding the Fourth Proportional to 287.89, 397.22 and 163.51

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Solution

The fourth proportional to 287.89, 397.22 and 163.51 is: 225.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.89 : 397.22 = 163.51 : x
  2. Step 2: Convert to fraction form
    287.89/397.22 = 163.51/x
  3. Step 3: Cross multiply
    287.89x = 397.22 × 163.51
  4. Step 4: Simplify right side
    287.89x = 64,947.46
  5. Step 5: Solve for x
    x = 64,947.46/287.89
  6. Step 6: Final answer
    x = 225.60

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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.