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Finding the Fourth Proportional to 553.83, 764.06 and 420.81

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Solution

The fourth proportional to 553.83, 764.06 and 420.81 is: 580.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.83 : 764.06 = 420.81 : x
  2. Step 2: Convert to fraction form
    553.83/764.06 = 420.81/x
  3. Step 3: Cross multiply
    553.83x = 764.06 × 420.81
  4. Step 4: Simplify right side
    553.83x = 321,521.98
  5. Step 5: Solve for x
    x = 321,521.98/553.83
  6. Step 6: Final answer
    x = 580.54

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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.