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Finding the Fourth Proportional to 724.19, 1,085.32 and 328.57

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Solution

The fourth proportional to 724.19, 1,085.32 and 328.57 is: 492.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.19 : 1,085.32 = 328.57 : x
  2. Step 2: Convert to fraction form
    724.19/1,085.32 = 328.57/x
  3. Step 3: Cross multiply
    724.19x = 1,085.32 × 328.57
  4. Step 4: Simplify right side
    724.19x = 356,600.06
  5. Step 5: Solve for x
    x = 356,600.06/724.19
  6. Step 6: Final answer
    x = 492.42

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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.