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Finding the Fourth Proportional to 420.36, 580.48 and 321.92

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Solution

The fourth proportional to 420.36, 580.48 and 321.92 is: 444.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.36 : 580.48 = 321.92 : x
  2. Step 2: Convert to fraction form
    420.36/580.48 = 321.92/x
  3. Step 3: Cross multiply
    420.36x = 580.48 × 321.92
  4. Step 4: Simplify right side
    420.36x = 186,868.12
  5. Step 5: Solve for x
    x = 186,868.12/420.36
  6. Step 6: Final answer
    x = 444.54

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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.