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Finding the Fourth Proportional to 677.72, 1,016.42 and 215.42

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Solution

The fourth proportional to 677.72, 1,016.42 and 215.42 is: 323.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.72 : 1,016.42 = 215.42 : x
  2. Step 2: Convert to fraction form
    677.72/1,016.42 = 215.42/x
  3. Step 3: Cross multiply
    677.72x = 1,016.42 × 215.42
  4. Step 4: Simplify right side
    677.72x = 218,957.20
  5. Step 5: Solve for x
    x = 218,957.20/677.72
  6. Step 6: Final answer
    x = 323.08

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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.