Home / 2,015.85-2,780.40-1,230.15

Finding the Fourth Proportional to 2,015.85, 2,780.40 and 1,230.15

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Solution

The fourth proportional to 2,015.85, 2,780.40 and 1,230.15 is: 1,696.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,015.85 : 2,780.40 = 1,230.15 : x
  2. Step 2: Convert to fraction form
    2,015.85/2,780.40 = 1,230.15/x
  3. Step 3: Cross multiply
    2,015.85x = 2,780.40 × 1,230.15
  4. Step 4: Simplify right side
    2,015.85x = 3,420,309.06
  5. Step 5: Solve for x
    x = 3,420,309.06/2,015.85
  6. Step 6: Final answer
    x = 1,696.71

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1.5x scale

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.