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Finding the Fourth Proportional to 212.87, 319.53 and 126.30

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Solution

The fourth proportional to 212.87, 319.53 and 126.30 is: 189.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.87 : 319.53 = 126.30 : x
  2. Step 2: Convert to fraction form
    212.87/319.53 = 126.30/x
  3. Step 3: Cross multiply
    212.87x = 319.53 × 126.30
  4. Step 4: Simplify right side
    212.87x = 40,356.64
  5. Step 5: Solve for x
    x = 40,356.64/212.87
  6. Step 6: Final answer
    x = 189.58

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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.