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Finding the Fourth Proportional to 554.20, 764.78 and 305.51

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Solution

The fourth proportional to 554.20, 764.78 and 305.51 is: 421.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.20 : 764.78 = 305.51 : x
  2. Step 2: Convert to fraction form
    554.20/764.78 = 305.51/x
  3. Step 3: Cross multiply
    554.20x = 764.78 × 305.51
  4. Step 4: Simplify right side
    554.20x = 233,651.62
  5. Step 5: Solve for x
    x = 233,651.62/554.20
  6. Step 6: Final answer
    x = 421.60

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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.