Home / 1,678.25-2,316.26-979.49

Finding the Fourth Proportional to 1,678.25, 2,316.26 and 979.49

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Solution

The fourth proportional to 1,678.25, 2,316.26 and 979.49 is: 1,351.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.25 : 2,316.26 = 979.49 : x
  2. Step 2: Convert to fraction form
    1,678.25/2,316.26 = 979.49/x
  3. Step 3: Cross multiply
    1,678.25x = 2,316.26 × 979.49
  4. Step 4: Simplify right side
    1,678.25x = 2,268,753.51
  5. Step 5: Solve for x
    x = 2,268,753.51/1,678.25
  6. Step 6: Final answer
    x = 1,351.86

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1.5x scale

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.