Home / 3,121.32-4,308.36-2,126.40

Finding the Fourth Proportional to 3,121.32, 4,308.36 and 2,126.40

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Solution

The fourth proportional to 3,121.32, 4,308.36 and 2,126.40 is: 2,935.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.32 : 4,308.36 = 2,126.40 : x
  2. Step 2: Convert to fraction form
    3,121.32/4,308.36 = 2,126.40/x
  3. Step 3: Cross multiply
    3,121.32x = 4,308.36 × 2,126.40
  4. Step 4: Simplify right side
    3,121.32x = 9,161,296.70
  5. Step 5: Solve for x
    x = 9,161,296.70/3,121.32
  6. Step 6: Final answer
    x = 2,935.07

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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.