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Finding the Fourth Proportional to 418.28, 577.77 and 321.23

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Solution

The fourth proportional to 418.28, 577.77 and 321.23 is: 443.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.28 : 577.77 = 321.23 : x
  2. Step 2: Convert to fraction form
    418.28/577.77 = 321.23/x
  3. Step 3: Cross multiply
    418.28x = 577.77 × 321.23
  4. Step 4: Simplify right side
    418.28x = 185,597.06
  5. Step 5: Solve for x
    x = 185,597.06/418.28
  6. Step 6: Final answer
    x = 443.72

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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.