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Finding the Fourth Proportional to 412.76, 618.80 and 321.86

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Solution

The fourth proportional to 412.76, 618.80 and 321.86 is: 482.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.76 : 618.80 = 321.86 : x
  2. Step 2: Convert to fraction form
    412.76/618.80 = 321.86/x
  3. Step 3: Cross multiply
    412.76x = 618.80 × 321.86
  4. Step 4: Simplify right side
    412.76x = 199,169.32
  5. Step 5: Solve for x
    x = 199,169.32/412.76
  6. Step 6: Final answer
    x = 482.53

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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.