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Finding the Fourth Proportional to 979.69, 1,469.76 and 330.41

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Solution

The fourth proportional to 979.69, 1,469.76 and 330.41 is: 495.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.69 : 1,469.76 = 330.41 : x
  2. Step 2: Convert to fraction form
    979.69/1,469.76 = 330.41/x
  3. Step 3: Cross multiply
    979.69x = 1,469.76 × 330.41
  4. Step 4: Simplify right side
    979.69x = 485,614.40
  5. Step 5: Solve for x
    x = 485,614.40/979.69
  6. Step 6: Final answer
    x = 495.68

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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.