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Finding the Fourth Proportional to 315.66, 435.48 and 199.20

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Solution

The fourth proportional to 315.66, 435.48 and 199.20 is: 274.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.66 : 435.48 = 199.20 : x
  2. Step 2: Convert to fraction form
    315.66/435.48 = 199.20/x
  3. Step 3: Cross multiply
    315.66x = 435.48 × 199.20
  4. Step 4: Simplify right side
    315.66x = 86,747.62
  5. Step 5: Solve for x
    x = 86,747.62/315.66
  6. Step 6: Final answer
    x = 274.81

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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.