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Finding the Fourth Proportional to 554.57, 765.28 and 321.70

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Solution

The fourth proportional to 554.57, 765.28 and 321.70 is: 443.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.57 : 765.28 = 321.70 : x
  2. Step 2: Convert to fraction form
    554.57/765.28 = 321.70/x
  3. Step 3: Cross multiply
    554.57x = 765.28 × 321.70
  4. Step 4: Simplify right side
    554.57x = 246,190.58
  5. Step 5: Solve for x
    x = 246,190.58/554.57
  6. Step 6: Final answer
    x = 443.93

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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.