Home / 1,021.38-1,409.40-579.19

Finding the Fourth Proportional to 1,021.38, 1,409.40 and 579.19

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Solution

The fourth proportional to 1,021.38, 1,409.40 and 579.19 is: 799.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.38 : 1,409.40 = 579.19 : x
  2. Step 2: Convert to fraction form
    1,021.38/1,409.40 = 579.19/x
  3. Step 3: Cross multiply
    1,021.38x = 1,409.40 × 579.19
  4. Step 4: Simplify right side
    1,021.38x = 816,310.39
  5. Step 5: Solve for x
    x = 816,310.39/1,021.38
  6. Step 6: Final answer
    x = 799.22

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Double scale
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1.5x scale

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.