Home / 1,678.01-2,315.67-979.25

Finding the Fourth Proportional to 1,678.01, 2,315.67 and 979.25

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Solution

The fourth proportional to 1,678.01, 2,315.67 and 979.25 is: 1,351.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.01 : 2,315.67 = 979.25 : x
  2. Step 2: Convert to fraction form
    1,678.01/2,315.67 = 979.25/x
  3. Step 3: Cross multiply
    1,678.01x = 2,315.67 × 979.25
  4. Step 4: Simplify right side
    1,678.01x = 2,267,619.85
  5. Step 5: Solve for x
    x = 2,267,619.85/1,678.01
  6. Step 6: Final answer
    x = 1,351.37

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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.