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Finding the Fourth Proportional to 873.54, 1,205.79 and 696.84

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Solution

The fourth proportional to 873.54, 1,205.79 and 696.84 is: 961.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.54 : 1,205.79 = 696.84 : x
  2. Step 2: Convert to fraction form
    873.54/1,205.79 = 696.84/x
  3. Step 3: Cross multiply
    873.54x = 1,205.79 × 696.84
  4. Step 4: Simplify right side
    873.54x = 840,242.70
  5. Step 5: Solve for x
    x = 840,242.70/873.54
  6. Step 6: Final answer
    x = 961.88

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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.