Home / 1,678.16-2,315.68-979.94

Finding the Fourth Proportional to 1,678.16, 2,315.68 and 979.94

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Solution

The fourth proportional to 1,678.16, 2,315.68 and 979.94 is: 1,352.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.16 : 2,315.68 = 979.94 : x
  2. Step 2: Convert to fraction form
    1,678.16/2,315.68 = 979.94/x
  3. Step 3: Cross multiply
    1,678.16x = 2,315.68 × 979.94
  4. Step 4: Simplify right side
    1,678.16x = 2,269,215.88
  5. Step 5: Solve for x
    x = 2,269,215.88/1,678.16
  6. Step 6: Final answer
    x = 1,352.21

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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.