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Finding the Fourth Proportional to 211.95, 315.36 and 205.47

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Solution

The fourth proportional to 211.95, 315.36 and 205.47 is: 305.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.95 : 315.36 = 205.47 : x
  2. Step 2: Convert to fraction form
    211.95/315.36 = 205.47/x
  3. Step 3: Cross multiply
    211.95x = 315.36 × 205.47
  4. Step 4: Simplify right side
    211.95x = 64,797.02
  5. Step 5: Solve for x
    x = 64,797.02/211.95
  6. Step 6: Final answer
    x = 305.72

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.