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Finding the Fourth Proportional to 428.03, 590.68 and 231.54

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Solution

The fourth proportional to 428.03, 590.68 and 231.54 is: 319.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.03 : 590.68 = 231.54 : x
  2. Step 2: Convert to fraction form
    428.03/590.68 = 231.54/x
  3. Step 3: Cross multiply
    428.03x = 590.68 × 231.54
  4. Step 4: Simplify right side
    428.03x = 136,766.05
  5. Step 5: Solve for x
    x = 136,766.05/428.03
  6. Step 6: Final answer
    x = 319.52

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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.