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Finding the Fourth Proportional to 810.81, 1,215.15 and 323.29

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Solution

The fourth proportional to 810.81, 1,215.15 and 323.29 is: 484.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.81 : 1,215.15 = 323.29 : x
  2. Step 2: Convert to fraction form
    810.81/1,215.15 = 323.29/x
  3. Step 3: Cross multiply
    810.81x = 1,215.15 × 323.29
  4. Step 4: Simplify right side
    810.81x = 392,847.97
  5. Step 5: Solve for x
    x = 392,847.97/810.81
  6. Step 6: Final answer
    x = 484.51

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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.