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Finding the Fourth Proportional to 211.80, 315.51 and 193.08

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Solution

The fourth proportional to 211.80, 315.51 and 193.08 is: 287.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.80 : 315.51 = 193.08 : x
  2. Step 2: Convert to fraction form
    211.80/315.51 = 193.08/x
  3. Step 3: Cross multiply
    211.80x = 315.51 × 193.08
  4. Step 4: Simplify right side
    211.80x = 60,918.67
  5. Step 5: Solve for x
    x = 60,918.67/211.80
  6. Step 6: Final answer
    x = 287.62

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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.