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Finding the Fourth Proportional to 559.42, 839.22 and 212.74

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Solution

The fourth proportional to 559.42, 839.22 and 212.74 is: 319.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.42 : 839.22 = 212.74 : x
  2. Step 2: Convert to fraction form
    559.42/839.22 = 212.74/x
  3. Step 3: Cross multiply
    559.42x = 839.22 × 212.74
  4. Step 4: Simplify right side
    559.42x = 178,535.66
  5. Step 5: Solve for x
    x = 178,535.66/559.42
  6. Step 6: Final answer
    x = 319.14

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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.