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Finding the Fourth Proportional to 769.76, 1,161.50 and 739.76

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Solution

The fourth proportional to 769.76, 1,161.50 and 739.76 is: 1,116.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.76 : 1,161.50 = 739.76 : x
  2. Step 2: Convert to fraction form
    769.76/1,161.50 = 739.76/x
  3. Step 3: Cross multiply
    769.76x = 1,161.50 × 739.76
  4. Step 4: Simplify right side
    769.76x = 859,231.24
  5. Step 5: Solve for x
    x = 859,231.24/769.76
  6. Step 6: Final answer
    x = 1,116.23

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.