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Finding the Fourth Proportional to 726.68, 1,003.24 and 478.43

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Solution

The fourth proportional to 726.68, 1,003.24 and 478.43 is: 660.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.68 : 1,003.24 = 478.43 : x
  2. Step 2: Convert to fraction form
    726.68/1,003.24 = 478.43/x
  3. Step 3: Cross multiply
    726.68x = 1,003.24 × 478.43
  4. Step 4: Simplify right side
    726.68x = 479,980.11
  5. Step 5: Solve for x
    x = 479,980.11/726.68
  6. Step 6: Final answer
    x = 660.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.