Home / 2,139.89-3,203.65-1,315.71

Finding the Fourth Proportional to 2,139.89, 3,203.65 and 1,315.71

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Solution

The fourth proportional to 2,139.89, 3,203.65 and 1,315.71 is: 1,969.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.89 : 3,203.65 = 1,315.71 : x
  2. Step 2: Convert to fraction form
    2,139.89/3,203.65 = 1,315.71/x
  3. Step 3: Cross multiply
    2,139.89x = 3,203.65 × 1,315.71
  4. Step 4: Simplify right side
    2,139.89x = 4,215,075.99
  5. Step 5: Solve for x
    x = 4,215,075.99/2,139.89
  6. Step 6: Final answer
    x = 1,969.77

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1.5x scale

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.