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Finding the Fourth Proportional to 723.31, 1,085.13 and 398.51

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Solution

The fourth proportional to 723.31, 1,085.13 and 398.51 is: 597.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.31 : 1,085.13 = 398.51 : x
  2. Step 2: Convert to fraction form
    723.31/1,085.13 = 398.51/x
  3. Step 3: Cross multiply
    723.31x = 1,085.13 × 398.51
  4. Step 4: Simplify right side
    723.31x = 432,433.16
  5. Step 5: Solve for x
    x = 432,433.16/723.31
  6. Step 6: Final answer
    x = 597.85

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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.