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Finding the Fourth Proportional to 723.27, 1,085.22 and 312.31

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Solution

The fourth proportional to 723.27, 1,085.22 and 312.31 is: 468.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.27 : 1,085.22 = 312.31 : x
  2. Step 2: Convert to fraction form
    723.27/1,085.22 = 312.31/x
  3. Step 3: Cross multiply
    723.27x = 1,085.22 × 312.31
  4. Step 4: Simplify right side
    723.27x = 338,918.07
  5. Step 5: Solve for x
    x = 338,918.07/723.27
  6. Step 6: Final answer
    x = 468.59

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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.