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Finding the Fourth Proportional to 769.66, 1,148.89 and 672.46

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Solution

The fourth proportional to 769.66, 1,148.89 and 672.46 is: 1,003.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.66 : 1,148.89 = 672.46 : x
  2. Step 2: Convert to fraction form
    769.66/1,148.89 = 672.46/x
  3. Step 3: Cross multiply
    769.66x = 1,148.89 × 672.46
  4. Step 4: Simplify right side
    769.66x = 772,579.21
  5. Step 5: Solve for x
    x = 772,579.21/769.66
  6. Step 6: Final answer
    x = 1,003.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.