Home / 1,120.21-1,679.13-426.43

Finding the Fourth Proportional to 1,120.21, 1,679.13 and 426.43

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Solution

The fourth proportional to 1,120.21, 1,679.13 and 426.43 is: 639.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.21 : 1,679.13 = 426.43 : x
  2. Step 2: Convert to fraction form
    1,120.21/1,679.13 = 426.43/x
  3. Step 3: Cross multiply
    1,120.21x = 1,679.13 × 426.43
  4. Step 4: Simplify right side
    1,120.21x = 716,031.41
  5. Step 5: Solve for x
    x = 716,031.41/1,120.21
  6. Step 6: Final answer
    x = 639.19

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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.