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Finding the Fourth Proportional to 1,021.78, 1,410.12 and 579.68

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Solution

The fourth proportional to 1,021.78, 1,410.12 and 579.68 is: 799.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.78 : 1,410.12 = 579.68 : x
  2. Step 2: Convert to fraction form
    1,021.78/1,410.12 = 579.68/x
  3. Step 3: Cross multiply
    1,021.78x = 1,410.12 × 579.68
  4. Step 4: Simplify right side
    1,021.78x = 817,418.36
  5. Step 5: Solve for x
    x = 817,418.36/1,021.78
  6. Step 6: Final answer
    x = 799.99

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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.