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Finding the Fourth Proportional to 769.12, 1,153.76 and 249.15

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Solution

The fourth proportional to 769.12, 1,153.76 and 249.15 is: 373.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.12 : 1,153.76 = 249.15 : x
  2. Step 2: Convert to fraction form
    769.12/1,153.76 = 249.15/x
  3. Step 3: Cross multiply
    769.12x = 1,153.76 × 249.15
  4. Step 4: Simplify right side
    769.12x = 287,459.30
  5. Step 5: Solve for x
    x = 287,459.30/769.12
  6. Step 6: Final answer
    x = 373.75

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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.