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Finding the Fourth Proportional to 1,244.18, 1,716.96 and 720.20

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Solution

The fourth proportional to 1,244.18, 1,716.96 and 720.20 is: 993.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,244.18 : 1,716.96 = 720.20 : x
  2. Step 2: Convert to fraction form
    1,244.18/1,716.96 = 720.20/x
  3. Step 3: Cross multiply
    1,244.18x = 1,716.96 × 720.20
  4. Step 4: Simplify right side
    1,244.18x = 1,236,554.59
  5. Step 5: Solve for x
    x = 1,236,554.59/1,244.18
  6. Step 6: Final answer
    x = 993.87

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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.