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Finding the Fourth Proportional to 677.69, 1,016.54 and 215.54

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Solution

The fourth proportional to 677.69, 1,016.54 and 215.54 is: 323.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.69 : 1,016.54 = 215.54 : x
  2. Step 2: Convert to fraction form
    677.69/1,016.54 = 215.54/x
  3. Step 3: Cross multiply
    677.69x = 1,016.54 × 215.54
  4. Step 4: Simplify right side
    677.69x = 219,108.11
  5. Step 5: Solve for x
    x = 219,108.11/677.69
  6. Step 6: Final answer
    x = 323.31

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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.