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Finding the Fourth Proportional to 199.69, 275.58 and 112.39

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Solution

The fourth proportional to 199.69, 275.58 and 112.39 is: 155.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.69 : 275.58 = 112.39 : x
  2. Step 2: Convert to fraction form
    199.69/275.58 = 112.39/x
  3. Step 3: Cross multiply
    199.69x = 275.58 × 112.39
  4. Step 4: Simplify right side
    199.69x = 30,971.75
  5. Step 5: Solve for x
    x = 30,971.75/199.69
  6. Step 6: Final answer
    x = 155.10

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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.