Home / 1,227.20-1,840.80-680.45

Finding the Fourth Proportional to 1,227.20, 1,840.80 and 680.45

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Solution

The fourth proportional to 1,227.20, 1,840.80 and 680.45 is: 1,020.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,227.20 : 1,840.80 = 680.45 : x
  2. Step 2: Convert to fraction form
    1,227.20/1,840.80 = 680.45/x
  3. Step 3: Cross multiply
    1,227.20x = 1,840.80 × 680.45
  4. Step 4: Simplify right side
    1,227.20x = 1,252,572.36
  5. Step 5: Solve for x
    x = 1,252,572.36/1,227.20
  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.