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Finding the Fourth Proportional to 199.89, 275.81 and 112.55

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Solution

The fourth proportional to 199.89, 275.81 and 112.55 is: 155.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.89 : 275.81 = 112.55 : x
  2. Step 2: Convert to fraction form
    199.89/275.81 = 112.55/x
  3. Step 3: Cross multiply
    199.89x = 275.81 × 112.55
  4. Step 4: Simplify right side
    199.89x = 31,040.47
  5. Step 5: Solve for x
    x = 31,040.47/199.89
  6. Step 6: Final answer
    x = 155.29

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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.