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Finding the Fourth Proportional to 558.56, 770.78 and 309.83

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Solution

The fourth proportional to 558.56, 770.78 and 309.83 is: 427.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.56 : 770.78 = 309.83 : x
  2. Step 2: Convert to fraction form
    558.56/770.78 = 309.83/x
  3. Step 3: Cross multiply
    558.56x = 770.78 × 309.83
  4. Step 4: Simplify right side
    558.56x = 238,805.36
  5. Step 5: Solve for x
    x = 238,805.36/558.56
  6. Step 6: Final answer
    x = 427.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.