Home / 1,765.20-2,435.84-979.12

Finding the Fourth Proportional to 1,765.20, 2,435.84 and 979.12

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Solution

The fourth proportional to 1,765.20, 2,435.84 and 979.12 is: 1,351.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,765.20 : 2,435.84 = 979.12 : x
  2. Step 2: Convert to fraction form
    1,765.20/2,435.84 = 979.12/x
  3. Step 3: Cross multiply
    1,765.20x = 2,435.84 × 979.12
  4. Step 4: Simplify right side
    1,765.20x = 2,384,979.66
  5. Step 5: Solve for x
    x = 2,384,979.66/1,765.20
  6. Step 6: Final answer
    x = 1,351.11

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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.