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Finding the Fourth Proportional to 724.76, 1,085.79 and 646.94

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Solution

The fourth proportional to 724.76, 1,085.79 and 646.94 is: 969.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.76 : 1,085.79 = 646.94 : x
  2. Step 2: Convert to fraction form
    724.76/1,085.79 = 646.94/x
  3. Step 3: Cross multiply
    724.76x = 1,085.79 × 646.94
  4. Step 4: Simplify right side
    724.76x = 702,443.70
  5. Step 5: Solve for x
    x = 702,443.70/724.76
  6. Step 6: Final answer
    x = 969.22

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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.