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Finding the Fourth Proportional to 421.98, 581.55 and 323.97

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Solution

The fourth proportional to 421.98, 581.55 and 323.97 is: 446.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.98 : 581.55 = 323.97 : x
  2. Step 2: Convert to fraction form
    421.98/581.55 = 323.97/x
  3. Step 3: Cross multiply
    421.98x = 581.55 × 323.97
  4. Step 4: Simplify right side
    421.98x = 188,404.75
  5. Step 5: Solve for x
    x = 188,404.75/421.98
  6. Step 6: Final answer
    x = 446.48

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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.