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Finding the Fourth Proportional to 979.28, 1,467.80 and 517.58

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Solution

The fourth proportional to 979.28, 1,467.80 and 517.58 is: 775.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.28 : 1,467.80 = 517.58 : x
  2. Step 2: Convert to fraction form
    979.28/1,467.80 = 517.58/x
  3. Step 3: Cross multiply
    979.28x = 1,467.80 × 517.58
  4. Step 4: Simplify right side
    979.28x = 759,703.92
  5. Step 5: Solve for x
    x = 759,703.92/979.28
  6. Step 6: Final answer
    x = 775.78

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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.