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Finding the Fourth Proportional to 231.58, 318.53 and 218.26

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Solution

The fourth proportional to 231.58, 318.53 and 218.26 is: 300.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.58 : 318.53 = 218.26 : x
  2. Step 2: Convert to fraction form
    231.58/318.53 = 218.26/x
  3. Step 3: Cross multiply
    231.58x = 318.53 × 218.26
  4. Step 4: Simplify right side
    231.58x = 69,522.36
  5. Step 5: Solve for x
    x = 69,522.36/231.58
  6. Step 6: Final answer
    x = 300.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.