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Finding the Fourth Proportional to 583.78, 805.61 and 321.79

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Solution

The fourth proportional to 583.78, 805.61 and 321.79 is: 444.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    583.78 : 805.61 = 321.79 : x
  2. Step 2: Convert to fraction form
    583.78/805.61 = 321.79/x
  3. Step 3: Cross multiply
    583.78x = 805.61 × 321.79
  4. Step 4: Simplify right side
    583.78x = 259,237.24
  5. Step 5: Solve for x
    x = 259,237.24/583.78
  6. Step 6: Final answer
    x = 444.07

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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.