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Finding the Fourth Proportional to 200.74, 300.78 and 128.44

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Solution

The fourth proportional to 200.74, 300.78 and 128.44 is: 192.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.74 : 300.78 = 128.44 : x
  2. Step 2: Convert to fraction form
    200.74/300.78 = 128.44/x
  3. Step 3: Cross multiply
    200.74x = 300.78 × 128.44
  4. Step 4: Simplify right side
    200.74x = 38,632.18
  5. Step 5: Solve for x
    x = 38,632.18/200.74
  6. Step 6: Final answer
    x = 192.45

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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.