Home / 1,021.34-1,409.40-579.20

Finding the Fourth Proportional to 1,021.34, 1,409.40 and 579.20

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Solution

The fourth proportional to 1,021.34, 1,409.40 and 579.20 is: 799.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.34 : 1,409.40 = 579.20 : x
  2. Step 2: Convert to fraction form
    1,021.34/1,409.40 = 579.20/x
  3. Step 3: Cross multiply
    1,021.34x = 1,409.40 × 579.20
  4. Step 4: Simplify right side
    1,021.34x = 816,324.48
  5. Step 5: Solve for x
    x = 816,324.48/1,021.34
  6. Step 6: Final answer
    x = 799.27

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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.