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Finding the Fourth Proportional to 570.22, 786.85 and 321.53

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Solution

The fourth proportional to 570.22, 786.85 and 321.53 is: 443.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.22 : 786.85 = 321.53 : x
  2. Step 2: Convert to fraction form
    570.22/786.85 = 321.53/x
  3. Step 3: Cross multiply
    570.22x = 786.85 × 321.53
  4. Step 4: Simplify right side
    570.22x = 252,995.88
  5. Step 5: Solve for x
    x = 252,995.88/570.22
  6. Step 6: Final answer
    x = 443.68

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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.