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Finding the Fourth Proportional to 726.46, 1,083.25 and 640.12

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Solution

The fourth proportional to 726.46, 1,083.25 and 640.12 is: 954.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.46 : 1,083.25 = 640.12 : x
  2. Step 2: Convert to fraction form
    726.46/1,083.25 = 640.12/x
  3. Step 3: Cross multiply
    726.46x = 1,083.25 × 640.12
  4. Step 4: Simplify right side
    726.46x = 693,409.99
  5. Step 5: Solve for x
    x = 693,409.99/726.46
  6. Step 6: Final answer
    x = 954.51

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.