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Finding the Fourth Proportional to 211.86, 318.96 and 186.35

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Solution

The fourth proportional to 211.86, 318.96 and 186.35 is: 280.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.86 : 318.96 = 186.35 : x
  2. Step 2: Convert to fraction form
    211.86/318.96 = 186.35/x
  3. Step 3: Cross multiply
    211.86x = 318.96 × 186.35
  4. Step 4: Simplify right side
    211.86x = 59,436.60
  5. Step 5: Solve for x
    x = 59,436.60/211.86
  6. Step 6: Final answer
    x = 280.55

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.