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Finding the Fourth Proportional to 412.92, 619.88 and 321.48

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Solution

The fourth proportional to 412.92, 619.88 and 321.48 is: 482.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.92 : 619.88 = 321.48 : x
  2. Step 2: Convert to fraction form
    412.92/619.88 = 321.48/x
  3. Step 3: Cross multiply
    412.92x = 619.88 × 321.48
  4. Step 4: Simplify right side
    412.92x = 199,279.02
  5. Step 5: Solve for x
    x = 199,279.02/412.92
  6. Step 6: Final answer
    x = 482.61

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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.