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Finding the Fourth Proportional to 213.98, 320.42 and 141.62

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Solution

The fourth proportional to 213.98, 320.42 and 141.62 is: 212.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.98 : 320.42 = 141.62 : x
  2. Step 2: Convert to fraction form
    213.98/320.42 = 141.62/x
  3. Step 3: Cross multiply
    213.98x = 320.42 × 141.62
  4. Step 4: Simplify right side
    213.98x = 45,376.63
  5. Step 5: Solve for x
    x = 45,376.63/213.98
  6. Step 6: Final answer
    x = 212.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.