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Finding the Fourth Proportional to 979.81, 1,469.80 and 321.43

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Solution

The fourth proportional to 979.81, 1,469.80 and 321.43 is: 482.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.81 : 1,469.80 = 321.43 : x
  2. Step 2: Convert to fraction form
    979.81/1,469.80 = 321.43/x
  3. Step 3: Cross multiply
    979.81x = 1,469.80 × 321.43
  4. Step 4: Simplify right side
    979.81x = 472,437.81
  5. Step 5: Solve for x
    x = 472,437.81/979.81
  6. Step 6: Final answer
    x = 482.17

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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.