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Finding the Fourth Proportional to 1,020.40, 1,408.11 and 578.31

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Solution

The fourth proportional to 1,020.40, 1,408.11 and 578.31 is: 798.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.40 : 1,408.11 = 578.31 : x
  2. Step 2: Convert to fraction form
    1,020.40/1,408.11 = 578.31/x
  3. Step 3: Cross multiply
    1,020.40x = 1,408.11 × 578.31
  4. Step 4: Simplify right side
    1,020.40x = 814,324.09
  5. Step 5: Solve for x
    x = 814,324.09/1,020.40
  6. Step 6: Final answer
    x = 798.04

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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.