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Finding the Fourth Proportional to 722.58, 1,086.39 and 579.30

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Solution

The fourth proportional to 722.58, 1,086.39 and 579.30 is: 870.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.58 : 1,086.39 = 579.30 : x
  2. Step 2: Convert to fraction form
    722.58/1,086.39 = 579.30/x
  3. Step 3: Cross multiply
    722.58x = 1,086.39 × 579.30
  4. Step 4: Simplify right side
    722.58x = 629,345.73
  5. Step 5: Solve for x
    x = 629,345.73/722.58
  6. Step 6: Final answer
    x = 870.97

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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.