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Finding the Fourth Proportional to 677.71, 1,016.62 and 215.53

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Solution

The fourth proportional to 677.71, 1,016.62 and 215.53 is: 323.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.71 : 1,016.62 = 215.53 : x
  2. Step 2: Convert to fraction form
    677.71/1,016.62 = 215.53/x
  3. Step 3: Cross multiply
    677.71x = 1,016.62 × 215.53
  4. Step 4: Simplify right side
    677.71x = 219,109.03
  5. Step 5: Solve for x
    x = 219,109.03/677.71
  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.