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Finding the Fourth Proportional to 769.44, 1,155.60 and 672.24

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Solution

The fourth proportional to 769.44, 1,155.60 and 672.24 is: 1,009.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.44 : 1,155.60 = 672.24 : x
  2. Step 2: Convert to fraction form
    769.44/1,155.60 = 672.24/x
  3. Step 3: Cross multiply
    769.44x = 1,155.60 × 672.24
  4. Step 4: Simplify right side
    769.44x = 776,840.54
  5. Step 5: Solve for x
    x = 776,840.54/769.44
  6. Step 6: Final answer
    x = 1,009.62

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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.