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Finding the Fourth Proportional to 211.56, 315.60 and 185.64

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Solution

The fourth proportional to 211.56, 315.60 and 185.64 is: 276.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.56 : 315.60 = 185.64 : x
  2. Step 2: Convert to fraction form
    211.56/315.60 = 185.64/x
  3. Step 3: Cross multiply
    211.56x = 315.60 × 185.64
  4. Step 4: Simplify right side
    211.56x = 58,587.98
  5. Step 5: Solve for x
    x = 58,587.98/211.56
  6. Step 6: Final answer
    x = 276.93

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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.