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Finding the Fourth Proportional to 979.62, 1,467.90 and 889.68

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Solution

The fourth proportional to 979.62, 1,467.90 and 889.68 is: 1,333.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.62 : 1,467.90 = 889.68 : x
  2. Step 2: Convert to fraction form
    979.62/1,467.90 = 889.68/x
  3. Step 3: Cross multiply
    979.62x = 1,467.90 × 889.68
  4. Step 4: Simplify right side
    979.62x = 1,305,961.27
  5. Step 5: Solve for x
    x = 1,305,961.27/979.62
  6. Step 6: Final answer
    x = 1,333.13

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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.