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Finding the Fourth Proportional to 200.72, 301.12 and 72.47

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Solution

The fourth proportional to 200.72, 301.12 and 72.47 is: 108.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.72 : 301.12 = 72.47 : x
  2. Step 2: Convert to fraction form
    200.72/301.12 = 72.47/x
  3. Step 3: Cross multiply
    200.72x = 301.12 × 72.47
  4. Step 4: Simplify right side
    200.72x = 21,822.02
  5. Step 5: Solve for x
    x = 21,822.02/200.72
  6. Step 6: Final answer
    x = 108.72

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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.