Home / 1,912.77-2,639.21-1,315.71

Finding the Fourth Proportional to 1,912.77, 2,639.21 and 1,315.71

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Solution

The fourth proportional to 1,912.77, 2,639.21 and 1,315.71 is: 1,815.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.77 : 2,639.21 = 1,315.71 : x
  2. Step 2: Convert to fraction form
    1,912.77/2,639.21 = 1,315.71/x
  3. Step 3: Cross multiply
    1,912.77x = 2,639.21 × 1,315.71
  4. Step 4: Simplify right side
    1,912.77x = 3,472,428.41
  5. Step 5: Solve for x
    x = 3,472,428.41/1,912.77
  6. Step 6: Final answer
    x = 1,815.39

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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.