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Finding the Fourth Proportional to 3,786.40, 5,209.68 and 3,698.92

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Solution

The fourth proportional to 3,786.40, 5,209.68 and 3,698.92 is: 5,089.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,786.40 : 5,209.68 = 3,698.92 : x
  2. Step 2: Convert to fraction form
    3,786.40/5,209.68 = 3,698.92/x
  3. Step 3: Cross multiply
    3,786.40x = 5,209.68 × 3,698.92
  4. Step 4: Simplify right side
    3,786.40x = 19,270,189.55
  5. Step 5: Solve for x
    x = 19,270,189.55/3,786.40
  6. Step 6: Final answer
    x = 5,089.32

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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.