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Finding the Fourth Proportional to 421.60, 581.07 and 338.56

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Solution

The fourth proportional to 421.60, 581.07 and 338.56 is: 466.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.60 : 581.07 = 338.56 : x
  2. Step 2: Convert to fraction form
    421.60/581.07 = 338.56/x
  3. Step 3: Cross multiply
    421.60x = 581.07 × 338.56
  4. Step 4: Simplify right side
    421.60x = 196,727.06
  5. Step 5: Solve for x
    x = 196,727.06/421.60
  6. Step 6: Final answer
    x = 466.62

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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.