Home / 1,786.45-2,668.78-1,421.65

Finding the Fourth Proportional to 1,786.45, 2,668.78 and 1,421.65

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Solution

The fourth proportional to 1,786.45, 2,668.78 and 1,421.65 is: 2,123.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,786.45 : 2,668.78 = 1,421.65 : x
  2. Step 2: Convert to fraction form
    1,786.45/2,668.78 = 1,421.65/x
  3. Step 3: Cross multiply
    1,786.45x = 2,668.78 × 1,421.65
  4. Step 4: Simplify right side
    1,786.45x = 3,794,064.42
  5. Step 5: Solve for x
    x = 3,794,064.42/1,786.45
  6. Step 6: Final answer
    x = 2,123.80

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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.