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Finding the Fourth Proportional to 1,020.69, 1,408.55 and 578.60

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Solution

The fourth proportional to 1,020.69, 1,408.55 and 578.60 is: 798.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.69 : 1,408.55 = 578.60 : x
  2. Step 2: Convert to fraction form
    1,020.69/1,408.55 = 578.60/x
  3. Step 3: Cross multiply
    1,020.69x = 1,408.55 × 578.60
  4. Step 4: Simplify right side
    1,020.69x = 814,977.09
  5. Step 5: Solve for x
    x = 814,977.09/1,020.69
  6. Step 6: Final answer
    x = 798.46

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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.