Home / 2,639.60-3,638.76-1,939.76

Finding the Fourth Proportional to 2,639.60, 3,638.76 and 1,939.76

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Solution

The fourth proportional to 2,639.60, 3,638.76 and 1,939.76 is: 2,674.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.60 : 3,638.76 = 1,939.76 : x
  2. Step 2: Convert to fraction form
    2,639.60/3,638.76 = 1,939.76/x
  3. Step 3: Cross multiply
    2,639.60x = 3,638.76 × 1,939.76
  4. Step 4: Simplify right side
    2,639.60x = 7,058,321.10
  5. Step 5: Solve for x
    x = 7,058,321.10/2,639.60
  6. Step 6: Final answer
    x = 2,674.01

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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.