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Finding the Fourth Proportional to 677.73, 1,016.72 and 215.39

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Solution

The fourth proportional to 677.73, 1,016.72 and 215.39 is: 323.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.73 : 1,016.72 = 215.39 : x
  2. Step 2: Convert to fraction form
    677.73/1,016.72 = 215.39/x
  3. Step 3: Cross multiply
    677.73x = 1,016.72 × 215.39
  4. Step 4: Simplify right side
    677.73x = 218,993.59
  5. Step 5: Solve for x
    x = 218,993.59/677.73
  6. Step 6: Final answer
    x = 323.13

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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.