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Finding the Fourth Proportional to 199.48, 298.78 and 145.25

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Solution

The fourth proportional to 199.48, 298.78 and 145.25 is: 217.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.48 : 298.78 = 145.25 : x
  2. Step 2: Convert to fraction form
    199.48/298.78 = 145.25/x
  3. Step 3: Cross multiply
    199.48x = 298.78 × 145.25
  4. Step 4: Simplify right side
    199.48x = 43,397.80
  5. Step 5: Solve for x
    x = 43,397.80/199.48
  6. Step 6: Final answer
    x = 217.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.