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Finding the Fourth Proportional to 252.12, 378.01 and 128.76

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Solution

The fourth proportional to 252.12, 378.01 and 128.76 is: 193.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.12 : 378.01 = 128.76 : x
  2. Step 2: Convert to fraction form
    252.12/378.01 = 128.76/x
  3. Step 3: Cross multiply
    252.12x = 378.01 × 128.76
  4. Step 4: Simplify right side
    252.12x = 48,673.99
  5. Step 5: Solve for x
    x = 48,673.99/252.12
  6. Step 6: Final answer
    x = 193.06

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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.