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Finding the Fourth Proportional to 554.36, 765.79 and 399.92

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Solution

The fourth proportional to 554.36, 765.79 and 399.92 is: 552.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.36 : 765.79 = 399.92 : x
  2. Step 2: Convert to fraction form
    554.36/765.79 = 399.92/x
  3. Step 3: Cross multiply
    554.36x = 765.79 × 399.92
  4. Step 4: Simplify right side
    554.36x = 306,249.91
  5. Step 5: Solve for x
    x = 306,249.91/554.36
  6. Step 6: Final answer
    x = 552.44

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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.