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Finding the Fourth Proportional to 1,021.83, 1,409.94 and 579.71

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Solution

The fourth proportional to 1,021.83, 1,409.94 and 579.71 is: 799.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.83 : 1,409.94 = 579.71 : x
  2. Step 2: Convert to fraction form
    1,021.83/1,409.94 = 579.71/x
  3. Step 3: Cross multiply
    1,021.83x = 1,409.94 × 579.71
  4. Step 4: Simplify right side
    1,021.83x = 817,349.27
  5. Step 5: Solve for x
    x = 817,349.27/1,021.83
  6. Step 6: Final answer
    x = 799.89

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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.