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Finding the Fourth Proportional to 1,021.19, 1,409.12 and 579.08

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Solution

The fourth proportional to 1,021.19, 1,409.12 and 579.08 is: 799.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.19 : 1,409.12 = 579.08 : x
  2. Step 2: Convert to fraction form
    1,021.19/1,409.12 = 579.08/x
  3. Step 3: Cross multiply
    1,021.19x = 1,409.12 × 579.08
  4. Step 4: Simplify right side
    1,021.19x = 815,983.27
  5. Step 5: Solve for x
    x = 815,983.27/1,021.19
  6. Step 6: Final answer
    x = 799.06

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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.