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Finding the Fourth Proportional to 769.46, 1,153.55 and 249.32

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Solution

The fourth proportional to 769.46, 1,153.55 and 249.32 is: 373.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.46 : 1,153.55 = 249.32 : x
  2. Step 2: Convert to fraction form
    769.46/1,153.55 = 249.32/x
  3. Step 3: Cross multiply
    769.46x = 1,153.55 × 249.32
  4. Step 4: Simplify right side
    769.46x = 287,606.59
  5. Step 5: Solve for x
    x = 287,606.59/769.46
  6. Step 6: Final answer
    x = 373.78

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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.