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Finding the Fourth Proportional to 1,020.70, 1,408.56 and 554.95

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Solution

The fourth proportional to 1,020.70, 1,408.56 and 554.95 is: 765.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.70 : 1,408.56 = 554.95 : x
  2. Step 2: Convert to fraction form
    1,020.70/1,408.56 = 554.95/x
  3. Step 3: Cross multiply
    1,020.70x = 1,408.56 × 554.95
  4. Step 4: Simplify right side
    1,020.70x = 781,680.37
  5. Step 5: Solve for x
    x = 781,680.37/1,020.70
  6. Step 6: Final answer
    x = 765.83

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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.