Home / 2,279.40-3,145.23-1,439.70

Finding the Fourth Proportional to 2,279.40, 3,145.23 and 1,439.70

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Solution

The fourth proportional to 2,279.40, 3,145.23 and 1,439.70 is: 1,986.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,279.40 : 3,145.23 = 1,439.70 : x
  2. Step 2: Convert to fraction form
    2,279.40/3,145.23 = 1,439.70/x
  3. Step 3: Cross multiply
    2,279.40x = 3,145.23 × 1,439.70
  4. Step 4: Simplify right side
    2,279.40x = 4,528,187.63
  5. Step 5: Solve for x
    x = 4,528,187.63/2,279.40
  6. Step 6: Final answer
    x = 1,986.57

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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.