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Finding the Fourth Proportional to 862.44, 1,189.80 and 697.20

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Solution

The fourth proportional to 862.44, 1,189.80 and 697.20 is: 961.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.44 : 1,189.80 = 697.20 : x
  2. Step 2: Convert to fraction form
    862.44/1,189.80 = 697.20/x
  3. Step 3: Cross multiply
    862.44x = 1,189.80 × 697.20
  4. Step 4: Simplify right side
    862.44x = 829,528.56
  5. Step 5: Solve for x
    x = 829,528.56/862.44
  6. Step 6: Final answer
    x = 961.84

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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.