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Finding the Fourth Proportional to 979.08, 1,351.21 and 559.43

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Solution

The fourth proportional to 979.08, 1,351.21 and 559.43 is: 772.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.08 : 1,351.21 = 559.43 : x
  2. Step 2: Convert to fraction form
    979.08/1,351.21 = 559.43/x
  3. Step 3: Cross multiply
    979.08x = 1,351.21 × 559.43
  4. Step 4: Simplify right side
    979.08x = 755,907.41
  5. Step 5: Solve for x
    x = 755,907.41/979.08
  6. Step 6: Final answer
    x = 772.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.