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Finding the Fourth Proportional to 1,172.85, 1,618.31 and 794.88

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Solution

The fourth proportional to 1,172.85, 1,618.31 and 794.88 is: 1,096.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.85 : 1,618.31 = 794.88 : x
  2. Step 2: Convert to fraction form
    1,172.85/1,618.31 = 794.88/x
  3. Step 3: Cross multiply
    1,172.85x = 1,618.31 × 794.88
  4. Step 4: Simplify right side
    1,172.85x = 1,286,364.24
  5. Step 5: Solve for x
    x = 1,286,364.24/1,172.85
  6. Step 6: Final answer
    x = 1,096.79

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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.