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Finding the Fourth Proportional to 287.40, 396.61 and 163.05

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Solution

The fourth proportional to 287.40, 396.61 and 163.05 is: 225.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.40 : 396.61 = 163.05 : x
  2. Step 2: Convert to fraction form
    287.40/396.61 = 163.05/x
  3. Step 3: Cross multiply
    287.40x = 396.61 × 163.05
  4. Step 4: Simplify right side
    287.40x = 64,667.26
  5. Step 5: Solve for x
    x = 64,667.26/287.40
  6. Step 6: Final answer
    x = 225.01

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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.