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Finding the Fourth Proportional to 1,020.99, 1,408.88 and 579

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Solution

The fourth proportional to 1,020.99, 1,408.88 and 579 is: 798.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.99 : 1,408.88 = 579 : x
  2. Step 2: Convert to fraction form
    1,020.99/1,408.88 = 579/x
  3. Step 3: Cross multiply
    1,020.99x = 1,408.88 × 579
  4. Step 4: Simplify right side
    1,020.99x = 815,742.97
  5. Step 5: Solve for x
    x = 815,742.97/1,020.99
  6. Step 6: Final answer
    x = 798.97

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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.