Home / 1,678.43-2,316.08-979.85

Finding the Fourth Proportional to 1,678.43, 2,316.08 and 979.85

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Solution

The fourth proportional to 1,678.43, 2,316.08 and 979.85 is: 1,352.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.43 : 2,316.08 = 979.85 : x
  2. Step 2: Convert to fraction form
    1,678.43/2,316.08 = 979.85/x
  3. Step 3: Cross multiply
    1,678.43x = 2,316.08 × 979.85
  4. Step 4: Simplify right side
    1,678.43x = 2,269,401.86
  5. Step 5: Solve for x
    x = 2,269,401.86/1,678.43
  6. Step 6: Final answer
    x = 1,352.10

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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.