Home / 1,945.20-2,918.88-1,215.12

Finding the Fourth Proportional to 1,945.20, 2,918.88 and 1,215.12

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Solution

The fourth proportional to 1,945.20, 2,918.88 and 1,215.12 is: 1,823.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,945.20 : 2,918.88 = 1,215.12 : x
  2. Step 2: Convert to fraction form
    1,945.20/2,918.88 = 1,215.12/x
  3. Step 3: Cross multiply
    1,945.20x = 2,918.88 × 1,215.12
  4. Step 4: Simplify right side
    1,945.20x = 3,546,789.47
  5. Step 5: Solve for x
    x = 3,546,789.47/1,945.20
  6. Step 6: Final answer
    x = 1,823.35

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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.