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Finding the Fourth Proportional to 199.88, 275.38 and 149.87

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Solution

The fourth proportional to 199.88, 275.38 and 149.87 is: 206.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.88 : 275.38 = 149.87 : x
  2. Step 2: Convert to fraction form
    199.88/275.38 = 149.87/x
  3. Step 3: Cross multiply
    199.88x = 275.38 × 149.87
  4. Step 4: Simplify right side
    199.88x = 41,271.20
  5. Step 5: Solve for x
    x = 41,271.20/199.88
  6. Step 6: Final answer
    x = 206.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.