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Finding the Fourth Proportional to 1,020.41, 1,408.15 and 554.66

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Solution

The fourth proportional to 1,020.41, 1,408.15 and 554.66 is: 765.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.41 : 1,408.15 = 554.66 : x
  2. Step 2: Convert to fraction form
    1,020.41/1,408.15 = 554.66/x
  3. Step 3: Cross multiply
    1,020.41x = 1,408.15 × 554.66
  4. Step 4: Simplify right side
    1,020.41x = 781,044.48
  5. Step 5: Solve for x
    x = 781,044.48/1,020.41
  6. Step 6: Final answer
    x = 765.42

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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.