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Finding the Fourth Proportional to 554.21, 764.79 and 305.53

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Solution

The fourth proportional to 554.21, 764.79 and 305.53 is: 421.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.21 : 764.79 = 305.53 : x
  2. Step 2: Convert to fraction form
    554.21/764.79 = 305.53/x
  3. Step 3: Cross multiply
    554.21x = 764.79 × 305.53
  4. Step 4: Simplify right side
    554.21x = 233,663.23
  5. Step 5: Solve for x
    x = 233,663.23/554.21
  6. Step 6: Final answer
    x = 421.61

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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.