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Finding the Fourth Proportional to 979.45, 1,351.57 and 559.78

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Solution

The fourth proportional to 979.45, 1,351.57 and 559.78 is: 772.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.45 : 1,351.57 = 559.78 : x
  2. Step 2: Convert to fraction form
    979.45/1,351.57 = 559.78/x
  3. Step 3: Cross multiply
    979.45x = 1,351.57 × 559.78
  4. Step 4: Simplify right side
    979.45x = 756,581.85
  5. Step 5: Solve for x
    x = 756,581.85/979.45
  6. Step 6: Final answer
    x = 772.46

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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.