Home / 2,274.90-3,139.31-1,390.70

Finding the Fourth Proportional to 2,274.90, 3,139.31 and 1,390.70

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Solution

The fourth proportional to 2,274.90, 3,139.31 and 1,390.70 is: 1,919.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,274.90 : 3,139.31 = 1,390.70 : x
  2. Step 2: Convert to fraction form
    2,274.90/3,139.31 = 1,390.70/x
  3. Step 3: Cross multiply
    2,274.90x = 3,139.31 × 1,390.70
  4. Step 4: Simplify right side
    2,274.90x = 4,365,815.77
  5. Step 5: Solve for x
    x = 4,365,815.77/2,274.90
  6. Step 6: Final answer
    x = 1,919.12

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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.