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Finding the Fourth Proportional to 583.39, 805.11 and 321.43

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Solution

The fourth proportional to 583.39, 805.11 and 321.43 is: 443.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    583.39 : 805.11 = 321.43 : x
  2. Step 2: Convert to fraction form
    583.39/805.11 = 321.43/x
  3. Step 3: Cross multiply
    583.39x = 805.11 × 321.43
  4. Step 4: Simplify right side
    583.39x = 258,780.87
  5. Step 5: Solve for x
    x = 258,780.87/583.39
  6. Step 6: Final answer
    x = 443.58

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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.