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Finding the Fourth Proportional to 200.12, 300.10 and 128.12

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Solution

The fourth proportional to 200.12, 300.10 and 128.12 is: 192.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.12 : 300.10 = 128.12 : x
  2. Step 2: Convert to fraction form
    200.12/300.10 = 128.12/x
  3. Step 3: Cross multiply
    200.12x = 300.10 × 128.12
  4. Step 4: Simplify right side
    200.12x = 38,448.81
  5. Step 5: Solve for x
    x = 38,448.81/200.12
  6. Step 6: Final answer
    x = 192.13

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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.