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Finding the Fourth Proportional to 1,021.91, 1,410.26 and 579.78

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Solution

The fourth proportional to 1,021.91, 1,410.26 and 579.78 is: 800.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.91 : 1,410.26 = 579.78 : x
  2. Step 2: Convert to fraction form
    1,021.91/1,410.26 = 579.78/x
  3. Step 3: Cross multiply
    1,021.91x = 1,410.26 × 579.78
  4. Step 4: Simplify right side
    1,021.91x = 817,637.64
  5. Step 5: Solve for x
    x = 817,637.64/1,021.91
  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.