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Finding the Fourth Proportional to 324.12, 485.72 and 285.52

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Solution

The fourth proportional to 324.12, 485.72 and 285.52 is: 427.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.12 : 485.72 = 285.52 : x
  2. Step 2: Convert to fraction form
    324.12/485.72 = 285.52/x
  3. Step 3: Cross multiply
    324.12x = 485.72 × 285.52
  4. Step 4: Simplify right side
    324.12x = 138,682.77
  5. Step 5: Solve for x
    x = 138,682.77/324.12
  6. Step 6: Final answer
    x = 427.87

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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.