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Finding the Fourth Proportional to 769.52, 1,064.04 and 720.56

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Solution

The fourth proportional to 769.52, 1,064.04 and 720.56 is: 996.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.52 : 1,064.04 = 720.56 : x
  2. Step 2: Convert to fraction form
    769.52/1,064.04 = 720.56/x
  3. Step 3: Cross multiply
    769.52x = 1,064.04 × 720.56
  4. Step 4: Simplify right side
    769.52x = 766,704.66
  5. Step 5: Solve for x
    x = 766,704.66/769.52
  6. Step 6: Final answer
    x = 996.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.