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Finding the Fourth Proportional to 779.07, 1,171.05 and 672.15

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Solution

The fourth proportional to 779.07, 1,171.05 and 672.15 is: 1,010.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.07 : 1,171.05 = 672.15 : x
  2. Step 2: Convert to fraction form
    779.07/1,171.05 = 672.15/x
  3. Step 3: Cross multiply
    779.07x = 1,171.05 × 672.15
  4. Step 4: Simplify right side
    779.07x = 787,121.26
  5. Step 5: Solve for x
    x = 787,121.26/779.07
  6. Step 6: Final answer
    x = 1,010.33

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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.