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Finding the Fourth Proportional to 199.81, 275.68 and 112.47

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Solution

The fourth proportional to 199.81, 275.68 and 112.47 is: 155.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.81 : 275.68 = 112.47 : x
  2. Step 2: Convert to fraction form
    199.81/275.68 = 112.47/x
  3. Step 3: Cross multiply
    199.81x = 275.68 × 112.47
  4. Step 4: Simplify right side
    199.81x = 31,005.17
  5. Step 5: Solve for x
    x = 31,005.17/199.81
  6. Step 6: Final answer
    x = 155.17

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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.