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Finding the Fourth Proportional to 979.19, 1,351.90 and 874.09

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Solution

The fourth proportional to 979.19, 1,351.90 and 874.09 is: 1,206.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.19 : 1,351.90 = 874.09 : x
  2. Step 2: Convert to fraction form
    979.19/1,351.90 = 874.09/x
  3. Step 3: Cross multiply
    979.19x = 1,351.90 × 874.09
  4. Step 4: Simplify right side
    979.19x = 1,181,682.27
  5. Step 5: Solve for x
    x = 1,181,682.27/979.19
  6. Step 6: Final answer
    x = 1,206.80

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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.