Home / 1,021.21-1,409.16-579.15

Finding the Fourth Proportional to 1,021.21, 1,409.16 and 579.15

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Solution

The fourth proportional to 1,021.21, 1,409.16 and 579.15 is: 799.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.21 : 1,409.16 = 579.15 : x
  2. Step 2: Convert to fraction form
    1,021.21/1,409.16 = 579.15/x
  3. Step 3: Cross multiply
    1,021.21x = 1,409.16 × 579.15
  4. Step 4: Simplify right side
    1,021.21x = 816,115.01
  5. Step 5: Solve for x
    x = 816,115.01/1,021.21
  6. Step 6: Final answer
    x = 799.16

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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.