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Finding the Fourth Proportional to 1,086.75, 1,630.44 and 317.25

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Solution

The fourth proportional to 1,086.75, 1,630.44 and 317.25 is: 475.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.75 : 1,630.44 = 317.25 : x
  2. Step 2: Convert to fraction form
    1,086.75/1,630.44 = 317.25/x
  3. Step 3: Cross multiply
    1,086.75x = 1,630.44 × 317.25
  4. Step 4: Simplify right side
    1,086.75x = 517,257.09
  5. Step 5: Solve for x
    x = 517,257.09/1,086.75
  6. Step 6: Final answer
    x = 475.97

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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.