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Finding the Fourth Proportional to 1,020.48, 1,408.25 and 554.73

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Solution

The fourth proportional to 1,020.48, 1,408.25 and 554.73 is: 765.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.48 : 1,408.25 = 554.73 : x
  2. Step 2: Convert to fraction form
    1,020.48/1,408.25 = 554.73/x
  3. Step 3: Cross multiply
    1,020.48x = 1,408.25 × 554.73
  4. Step 4: Simplify right side
    1,020.48x = 781,195.75
  5. Step 5: Solve for x
    x = 781,195.75/1,020.48
  6. Step 6: Final answer
    x = 765.52

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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.