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Finding the Fourth Proportional to 163.46, 225.64 and 128.40

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Solution

The fourth proportional to 163.46, 225.64 and 128.40 is: 177.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.46 : 225.64 = 128.40 : x
  2. Step 2: Convert to fraction form
    163.46/225.64 = 128.40/x
  3. Step 3: Cross multiply
    163.46x = 225.64 × 128.40
  4. Step 4: Simplify right side
    163.46x = 28,972.18
  5. Step 5: Solve for x
    x = 28,972.18/163.46
  6. Step 6: Final answer
    x = 177.24

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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.