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Finding the Fourth Proportional to 212.63, 317.32 and 189.54

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Solution

The fourth proportional to 212.63, 317.32 and 189.54 is: 282.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.63 : 317.32 = 189.54 : x
  2. Step 2: Convert to fraction form
    212.63/317.32 = 189.54/x
  3. Step 3: Cross multiply
    212.63x = 317.32 × 189.54
  4. Step 4: Simplify right side
    212.63x = 60,144.36
  5. Step 5: Solve for x
    x = 60,144.36/212.63
  6. Step 6: Final answer
    x = 282.87

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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.