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Finding the Fourth Proportional to 213.48, 318.56 and 189.18

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Solution

The fourth proportional to 213.48, 318.56 and 189.18 is: 282.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.48 : 318.56 = 189.18 : x
  2. Step 2: Convert to fraction form
    213.48/318.56 = 189.18/x
  3. Step 3: Cross multiply
    213.48x = 318.56 × 189.18
  4. Step 4: Simplify right side
    213.48x = 60,265.18
  5. Step 5: Solve for x
    x = 60,265.18/213.48
  6. Step 6: Final answer
    x = 282.30

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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.