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Finding the Fourth Proportional to 420.56, 580.20 and 263.26

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Solution

The fourth proportional to 420.56, 580.20 and 263.26 is: 363.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.56 : 580.20 = 263.26 : x
  2. Step 2: Convert to fraction form
    420.56/580.20 = 263.26/x
  3. Step 3: Cross multiply
    420.56x = 580.20 × 263.26
  4. Step 4: Simplify right side
    420.56x = 152,743.19
  5. Step 5: Solve for x
    x = 152,743.19/420.56
  6. Step 6: Final answer
    x = 363.19

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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.