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Finding the Fourth Proportional to 212.67, 317.19 and 189.57

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Solution

The fourth proportional to 212.67, 317.19 and 189.57 is: 282.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.67 : 317.19 = 189.57 : x
  2. Step 2: Convert to fraction form
    212.67/317.19 = 189.57/x
  3. Step 3: Cross multiply
    212.67x = 317.19 × 189.57
  4. Step 4: Simplify right side
    212.67x = 60,129.71
  5. Step 5: Solve for x
    x = 60,129.71/212.67
  6. Step 6: Final answer
    x = 282.74

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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.