Home / 1,021.89-1,410.19-579.80

Finding the Fourth Proportional to 1,021.89, 1,410.19 and 579.80

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Solution

The fourth proportional to 1,021.89, 1,410.19 and 579.80 is: 800.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.89 : 1,410.19 = 579.80 : x
  2. Step 2: Convert to fraction form
    1,021.89/1,410.19 = 579.80/x
  3. Step 3: Cross multiply
    1,021.89x = 1,410.19 × 579.80
  4. Step 4: Simplify right side
    1,021.89x = 817,619.66
  5. Step 5: Solve for x
    x = 817,619.66/1,021.89
  6. Step 6: Final answer
    x = 800.11

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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.