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Finding the Fourth Proportional to 199.76, 275.55 and 137.48

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Solution

The fourth proportional to 199.76, 275.55 and 137.48 is: 189.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.76 : 275.55 = 137.48 : x
  2. Step 2: Convert to fraction form
    199.76/275.55 = 137.48/x
  3. Step 3: Cross multiply
    199.76x = 275.55 × 137.48
  4. Step 4: Simplify right side
    199.76x = 37,882.61
  5. Step 5: Solve for x
    x = 37,882.61/199.76
  6. Step 6: Final answer
    x = 189.64

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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.