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Finding the Fourth Proportional to 212.63, 319.59 and 140.94

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Solution

The fourth proportional to 212.63, 319.59 and 140.94 is: 211.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.63 : 319.59 = 140.94 : x
  2. Step 2: Convert to fraction form
    212.63/319.59 = 140.94/x
  3. Step 3: Cross multiply
    212.63x = 319.59 × 140.94
  4. Step 4: Simplify right side
    212.63x = 45,043.01
  5. Step 5: Solve for x
    x = 45,043.01/212.63
  6. Step 6: Final answer
    x = 211.84

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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.