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Finding the Fourth Proportional to 554.78, 765.63 and 321.92

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Solution

The fourth proportional to 554.78, 765.63 and 321.92 is: 444.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.78 : 765.63 = 321.92 : x
  2. Step 2: Convert to fraction form
    554.78/765.63 = 321.92/x
  3. Step 3: Cross multiply
    554.78x = 765.63 × 321.92
  4. Step 4: Simplify right side
    554.78x = 246,471.61
  5. Step 5: Solve for x
    x = 246,471.61/554.78
  6. Step 6: Final answer
    x = 444.27

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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.