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Finding the Fourth Proportional to 200.28, 300.45 and 72

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Solution

The fourth proportional to 200.28, 300.45 and 72 is: 108.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.28 : 300.45 = 72 : x
  2. Step 2: Convert to fraction form
    200.28/300.45 = 72/x
  3. Step 3: Cross multiply
    200.28x = 300.45 × 72
  4. Step 4: Simplify right side
    200.28x = 21,632.40
  5. Step 5: Solve for x
    x = 21,632.40/200.28
  6. Step 6: Final answer
    x = 108.01

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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.