Home / 1,918.30-2,645.71-1,288.64

Finding the Fourth Proportional to 1,918.30, 2,645.71 and 1,288.64

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Solution

The fourth proportional to 1,918.30, 2,645.71 and 1,288.64 is: 1,777.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,918.30 : 2,645.71 = 1,288.64 : x
  2. Step 2: Convert to fraction form
    1,918.30/2,645.71 = 1,288.64/x
  3. Step 3: Cross multiply
    1,918.30x = 2,645.71 × 1,288.64
  4. Step 4: Simplify right side
    1,918.30x = 3,409,348.06
  5. Step 5: Solve for x
    x = 3,409,348.06/1,918.30
  6. Step 6: Final answer
    x = 1,777.28

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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.