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Finding the Fourth Proportional to 420.57, 630.96 and 173.79

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Solution

The fourth proportional to 420.57, 630.96 and 173.79 is: 260.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.57 : 630.96 = 173.79 : x
  2. Step 2: Convert to fraction form
    420.57/630.96 = 173.79/x
  3. Step 3: Cross multiply
    420.57x = 630.96 × 173.79
  4. Step 4: Simplify right side
    420.57x = 109,654.54
  5. Step 5: Solve for x
    x = 109,654.54/420.57
  6. Step 6: Final answer
    x = 260.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.