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Finding the Fourth Proportional to 578.56, 798.78 and 357.72

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Solution

The fourth proportional to 578.56, 798.78 and 357.72 is: 493.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.56 : 798.78 = 357.72 : x
  2. Step 2: Convert to fraction form
    578.56/798.78 = 357.72/x
  3. Step 3: Cross multiply
    578.56x = 798.78 × 357.72
  4. Step 4: Simplify right side
    578.56x = 285,739.58
  5. Step 5: Solve for x
    x = 285,739.58/578.56
  6. Step 6: Final answer
    x = 493.88

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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.