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Finding the Fourth Proportional to 677.45, 1,016.15 and 215.23

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Solution

The fourth proportional to 677.45, 1,016.15 and 215.23 is: 322.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.45 : 1,016.15 = 215.23 : x
  2. Step 2: Convert to fraction form
    677.45/1,016.15 = 215.23/x
  3. Step 3: Cross multiply
    677.45x = 1,016.15 × 215.23
  4. Step 4: Simplify right side
    677.45x = 218,702.35
  5. Step 5: Solve for x
    x = 218,702.35/677.45
  6. Step 6: Final answer
    x = 322.83

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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.