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Finding the Fourth Proportional to 660.21, 990.62 and 335.60

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Solution

The fourth proportional to 660.21, 990.62 and 335.60 is: 503.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.21 : 990.62 = 335.60 : x
  2. Step 2: Convert to fraction form
    660.21/990.62 = 335.60/x
  3. Step 3: Cross multiply
    660.21x = 990.62 × 335.60
  4. Step 4: Simplify right side
    660.21x = 332,452.07
  5. Step 5: Solve for x
    x = 332,452.07/660.21
  6. Step 6: Final answer
    x = 503.56

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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.