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Finding the Fourth Proportional to 252.16, 378.09 and 128.69

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Solution

The fourth proportional to 252.16, 378.09 and 128.69 is: 192.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.16 : 378.09 = 128.69 : x
  2. Step 2: Convert to fraction form
    252.16/378.09 = 128.69/x
  3. Step 3: Cross multiply
    252.16x = 378.09 × 128.69
  4. Step 4: Simplify right side
    252.16x = 48,653.87
  5. Step 5: Solve for x
    x = 48,653.87/252.16
  6. Step 6: Final answer
    x = 192.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.