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Finding the Fourth Proportional to 769.12, 1,153.88 and 422.36

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Solution

The fourth proportional to 769.12, 1,153.88 and 422.36 is: 633.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.12 : 1,153.88 = 422.36 : x
  2. Step 2: Convert to fraction form
    769.12/1,153.88 = 422.36/x
  3. Step 3: Cross multiply
    769.12x = 1,153.88 × 422.36
  4. Step 4: Simplify right side
    769.12x = 487,352.76
  5. Step 5: Solve for x
    x = 487,352.76/769.12
  6. Step 6: Final answer
    x = 633.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.