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Finding the Fourth Proportional to 211.94, 315.51 and 209.60

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Solution

The fourth proportional to 211.94, 315.51 and 209.60 is: 312.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.94 : 315.51 = 209.60 : x
  2. Step 2: Convert to fraction form
    211.94/315.51 = 209.60/x
  3. Step 3: Cross multiply
    211.94x = 315.51 × 209.60
  4. Step 4: Simplify right side
    211.94x = 66,129.32
  5. Step 5: Solve for x
    x = 66,129.32/211.94
  6. Step 6: Final answer
    x = 312.03

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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.