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Finding the Fourth Proportional to 559.56, 839.36 and 212.85

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Solution

The fourth proportional to 559.56, 839.36 and 212.85 is: 319.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.56 : 839.36 = 212.85 : x
  2. Step 2: Convert to fraction form
    559.56/839.36 = 212.85/x
  3. Step 3: Cross multiply
    559.56x = 839.36 × 212.85
  4. Step 4: Simplify right side
    559.56x = 178,656.71
  5. Step 5: Solve for x
    x = 178,656.71/559.56
  6. Step 6: Final answer
    x = 319.28

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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.