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Finding the Fourth Proportional to 420.55, 580.35 and 234.03

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Solution

The fourth proportional to 420.55, 580.35 and 234.03 is: 322.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.55 : 580.35 = 234.03 : x
  2. Step 2: Convert to fraction form
    420.55/580.35 = 234.03/x
  3. Step 3: Cross multiply
    420.55x = 580.35 × 234.03
  4. Step 4: Simplify right side
    420.55x = 135,819.31
  5. Step 5: Solve for x
    x = 135,819.31/420.55
  6. Step 6: Final answer
    x = 322.96

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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.