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Finding the Fourth Proportional to 1,172.15, 1,617.88 and 729.79

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Solution

The fourth proportional to 1,172.15, 1,617.88 and 729.79 is: 1,007.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.15 : 1,617.88 = 729.79 : x
  2. Step 2: Convert to fraction form
    1,172.15/1,617.88 = 729.79/x
  3. Step 3: Cross multiply
    1,172.15x = 1,617.88 × 729.79
  4. Step 4: Simplify right side
    1,172.15x = 1,180,704.56
  5. Step 5: Solve for x
    x = 1,180,704.56/1,172.15
  6. Step 6: Final answer
    x = 1,007.30

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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.