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Finding the Fourth Proportional to 769.56, 1,153.30 and 422.37

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Solution

The fourth proportional to 769.56, 1,153.30 and 422.37 is: 632.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.56 : 1,153.30 = 422.37 : x
  2. Step 2: Convert to fraction form
    769.56/1,153.30 = 422.37/x
  3. Step 3: Cross multiply
    769.56x = 1,153.30 × 422.37
  4. Step 4: Simplify right side
    769.56x = 487,119.32
  5. Step 5: Solve for x
    x = 487,119.32/769.56
  6. Step 6: Final answer
    x = 632.98

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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.