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Finding the Fourth Proportional to 810.31, 1,216.07 and 323.40

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Solution

The fourth proportional to 810.31, 1,216.07 and 323.40 is: 485.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.31 : 1,216.07 = 323.40 : x
  2. Step 2: Convert to fraction form
    810.31/1,216.07 = 323.40/x
  3. Step 3: Cross multiply
    810.31x = 1,216.07 × 323.40
  4. Step 4: Simplify right side
    810.31x = 393,277.04
  5. Step 5: Solve for x
    x = 393,277.04/810.31
  6. Step 6: Final answer
    x = 485.34

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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.