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Finding the Fourth Proportional to 809.90, 1,214.97 and 316.22

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Solution

The fourth proportional to 809.90, 1,214.97 and 316.22 is: 474.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.90 : 1,214.97 = 316.22 : x
  2. Step 2: Convert to fraction form
    809.90/1,214.97 = 316.22/x
  3. Step 3: Cross multiply
    809.90x = 1,214.97 × 316.22
  4. Step 4: Simplify right side
    809.90x = 384,190.16
  5. Step 5: Solve for x
    x = 384,190.16/809.90
  6. Step 6: Final answer
    x = 474.37

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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.