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Finding the Fourth Proportional to 724.14, 1,085.81 and 339.39

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Solution

The fourth proportional to 724.14, 1,085.81 and 339.39 is: 508.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.14 : 1,085.81 = 339.39 : x
  2. Step 2: Convert to fraction form
    724.14/1,085.81 = 339.39/x
  3. Step 3: Cross multiply
    724.14x = 1,085.81 × 339.39
  4. Step 4: Simplify right side
    724.14x = 368,511.36
  5. Step 5: Solve for x
    x = 368,511.36/724.14
  6. Step 6: Final answer
    x = 508.90

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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.