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Finding the Fourth Proportional to 659.21, 990.61 and 351.28

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Solution

The fourth proportional to 659.21, 990.61 and 351.28 is: 527.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.21 : 990.61 = 351.28 : x
  2. Step 2: Convert to fraction form
    659.21/990.61 = 351.28/x
  3. Step 3: Cross multiply
    659.21x = 990.61 × 351.28
  4. Step 4: Simplify right side
    659.21x = 347,979.72
  5. Step 5: Solve for x
    x = 347,979.72/659.21
  6. Step 6: Final answer
    x = 527.88

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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.