Home / 1,678.24-2,315.96-979.60

Finding the Fourth Proportional to 1,678.24, 2,315.96 and 979.60

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Solution

The fourth proportional to 1,678.24, 2,315.96 and 979.60 is: 1,351.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.24 : 2,315.96 = 979.60 : x
  2. Step 2: Convert to fraction form
    1,678.24/2,315.96 = 979.60/x
  3. Step 3: Cross multiply
    1,678.24x = 2,315.96 × 979.60
  4. Step 4: Simplify right side
    1,678.24x = 2,268,714.42
  5. Step 5: Solve for x
    x = 2,268,714.42/1,678.24
  6. Step 6: Final answer
    x = 1,351.84

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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.