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Finding the Fourth Proportional to 211.71, 318.85 and 186.36

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Solution

The fourth proportional to 211.71, 318.85 and 186.36 is: 280.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.71 : 318.85 = 186.36 : x
  2. Step 2: Convert to fraction form
    211.71/318.85 = 186.36/x
  3. Step 3: Cross multiply
    211.71x = 318.85 × 186.36
  4. Step 4: Simplify right side
    211.71x = 59,419.95
  5. Step 5: Solve for x
    x = 59,419.95/211.71
  6. Step 6: Final answer
    x = 280.67

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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.