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Finding the Fourth Proportional to 554.08, 764.28 and 396.40

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Solution

The fourth proportional to 554.08, 764.28 and 396.40 is: 546.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.08 : 764.28 = 396.40 : x
  2. Step 2: Convert to fraction form
    554.08/764.28 = 396.40/x
  3. Step 3: Cross multiply
    554.08x = 764.28 × 396.40
  4. Step 4: Simplify right side
    554.08x = 302,960.59
  5. Step 5: Solve for x
    x = 302,960.59/554.08
  6. Step 6: Final answer
    x = 546.78

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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.