Home / 1,392.39-2,078.46-1,329.21

Finding the Fourth Proportional to 1,392.39, 2,078.46 and 1,329.21

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Solution

The fourth proportional to 1,392.39, 2,078.46 and 1,329.21 is: 1,984.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.39 : 2,078.46 = 1,329.21 : x
  2. Step 2: Convert to fraction form
    1,392.39/2,078.46 = 1,329.21/x
  3. Step 3: Cross multiply
    1,392.39x = 2,078.46 × 1,329.21
  4. Step 4: Simplify right side
    1,392.39x = 2,762,709.82
  5. Step 5: Solve for x
    x = 2,762,709.82/1,392.39
  6. Step 6: Final answer
    x = 1,984.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.