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Finding the Fourth Proportional to 211.14, 315.55 and 194.72

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Solution

The fourth proportional to 211.14, 315.55 and 194.72 is: 291.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.14 : 315.55 = 194.72 : x
  2. Step 2: Convert to fraction form
    211.14/315.55 = 194.72/x
  3. Step 3: Cross multiply
    211.14x = 315.55 × 194.72
  4. Step 4: Simplify right side
    211.14x = 61,443.24
  5. Step 5: Solve for x
    x = 61,443.24/211.14
  6. Step 6: Final answer
    x = 291.01

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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.