Home / 1,266.21-1,899.47-680.40

Finding the Fourth Proportional to 1,266.21, 1,899.47 and 680.40

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Solution

The fourth proportional to 1,266.21, 1,899.47 and 680.40 is: 1,020.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,266.21 : 1,899.47 = 680.40 : x
  2. Step 2: Convert to fraction form
    1,266.21/1,899.47 = 680.40/x
  3. Step 3: Cross multiply
    1,266.21x = 1,899.47 × 680.40
  4. Step 4: Simplify right side
    1,266.21x = 1,292,399.39
  5. Step 5: Solve for x
    x = 1,292,399.39/1,266.21
  6. Step 6: Final answer
    x = 1,020.68

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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.