Home / 1,645.36-2,469.66-780.28

Finding the Fourth Proportional to 1,645.36, 2,469.66 and 780.28

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Solution

The fourth proportional to 1,645.36, 2,469.66 and 780.28 is: 1,171.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,645.36 : 2,469.66 = 780.28 : x
  2. Step 2: Convert to fraction form
    1,645.36/2,469.66 = 780.28/x
  3. Step 3: Cross multiply
    1,645.36x = 2,469.66 × 780.28
  4. Step 4: Simplify right side
    1,645.36x = 1,927,026.30
  5. Step 5: Solve for x
    x = 1,927,026.30/1,645.36
  6. Step 6: Final answer
    x = 1,171.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.