Home / 1,677.70-2,316.09-979.78

Finding the Fourth Proportional to 1,677.70, 2,316.09 and 979.78

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Solution

The fourth proportional to 1,677.70, 2,316.09 and 979.78 is: 1,352.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,677.70 : 2,316.09 = 979.78 : x
  2. Step 2: Convert to fraction form
    1,677.70/2,316.09 = 979.78/x
  3. Step 3: Cross multiply
    1,677.70x = 2,316.09 × 979.78
  4. Step 4: Simplify right side
    1,677.70x = 2,269,258.66
  5. Step 5: Solve for x
    x = 2,269,258.66/1,677.70
  6. Step 6: Final answer
    x = 1,352.60

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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.