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Finding the Fourth Proportional to 199.95, 275.87 and 115.90

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Solution

The fourth proportional to 199.95, 275.87 and 115.90 is: 159.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.95 : 275.87 = 115.90 : x
  2. Step 2: Convert to fraction form
    199.95/275.87 = 115.90/x
  3. Step 3: Cross multiply
    199.95x = 275.87 × 115.90
  4. Step 4: Simplify right side
    199.95x = 31,973.33
  5. Step 5: Solve for x
    x = 31,973.33/199.95
  6. Step 6: Final answer
    x = 159.91

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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.