Home / 1,778.40-2,668.32-1,387.80

Finding the Fourth Proportional to 1,778.40, 2,668.32 and 1,387.80

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Solution

The fourth proportional to 1,778.40, 2,668.32 and 1,387.80 is: 2,082.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,778.40 : 2,668.32 = 1,387.80 : x
  2. Step 2: Convert to fraction form
    1,778.40/2,668.32 = 1,387.80/x
  3. Step 3: Cross multiply
    1,778.40x = 2,668.32 × 1,387.80
  4. Step 4: Simplify right side
    1,778.40x = 3,703,094.50
  5. Step 5: Solve for x
    x = 3,703,094.50/1,778.40
  6. Step 6: Final answer
    x = 2,082.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.