Home / 1,120.18-1,680.48-426.82

Finding the Fourth Proportional to 1,120.18, 1,680.48 and 426.82

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Solution

The fourth proportional to 1,120.18, 1,680.48 and 426.82 is: 640.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.18 : 1,680.48 = 426.82 : x
  2. Step 2: Convert to fraction form
    1,120.18/1,680.48 = 426.82/x
  3. Step 3: Cross multiply
    1,120.18x = 1,680.48 × 426.82
  4. Step 4: Simplify right side
    1,120.18x = 717,262.47
  5. Step 5: Solve for x
    x = 717,262.47/1,120.18
  6. Step 6: Final answer
    x = 640.31

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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.