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Finding the Fourth Proportional to 1,021.76, 1,409.94 and 579.64

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Solution

The fourth proportional to 1,021.76, 1,409.94 and 579.64 is: 799.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.76 : 1,409.94 = 579.64 : x
  2. Step 2: Convert to fraction form
    1,021.76/1,409.94 = 579.64/x
  3. Step 3: Cross multiply
    1,021.76x = 1,409.94 × 579.64
  4. Step 4: Simplify right side
    1,021.76x = 817,257.62
  5. Step 5: Solve for x
    x = 817,257.62/1,021.76
  6. Step 6: Final answer
    x = 799.85

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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.