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Finding the Fourth Proportional to 1,218.67, 1,680.97 and 720.96

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Solution

The fourth proportional to 1,218.67, 1,680.97 and 720.96 is: 994.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.67 : 1,680.97 = 720.96 : x
  2. Step 2: Convert to fraction form
    1,218.67/1,680.97 = 720.96/x
  3. Step 3: Cross multiply
    1,218.67x = 1,680.97 × 720.96
  4. Step 4: Simplify right side
    1,218.67x = 1,211,903.73
  5. Step 5: Solve for x
    x = 1,211,903.73/1,218.67
  6. Step 6: Final answer
    x = 994.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.