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Finding the Fourth Proportional to 979.64, 1,469.50 and 330.38

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Solution

The fourth proportional to 979.64, 1,469.50 and 330.38 is: 495.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.64 : 1,469.50 = 330.38 : x
  2. Step 2: Convert to fraction form
    979.64/1,469.50 = 330.38/x
  3. Step 3: Cross multiply
    979.64x = 1,469.50 × 330.38
  4. Step 4: Simplify right side
    979.64x = 485,491.76
  5. Step 5: Solve for x
    x = 485,491.76/979.64
  6. Step 6: Final answer
    x = 495.58

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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.