Home / 1,339.68-2,021.88-1,305.12

Finding the Fourth Proportional to 1,339.68, 2,021.88 and 1,305.12

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Solution

The fourth proportional to 1,339.68, 2,021.88 and 1,305.12 is: 1,969.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.68 : 2,021.88 = 1,305.12 : x
  2. Step 2: Convert to fraction form
    1,339.68/2,021.88 = 1,305.12/x
  3. Step 3: Cross multiply
    1,339.68x = 2,021.88 × 1,305.12
  4. Step 4: Simplify right side
    1,339.68x = 2,638,796.03
  5. Step 5: Solve for x
    x = 2,638,796.03/1,339.68
  6. Step 6: Final answer
    x = 1,969.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.