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Finding the Fourth Proportional to 726.89, 1,003.43 and 478.22

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Solution

The fourth proportional to 726.89, 1,003.43 and 478.22 is: 660.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.89 : 1,003.43 = 478.22 : x
  2. Step 2: Convert to fraction form
    726.89/1,003.43 = 478.22/x
  3. Step 3: Cross multiply
    726.89x = 1,003.43 × 478.22
  4. Step 4: Simplify right side
    726.89x = 479,856.47
  5. Step 5: Solve for x
    x = 479,856.47/726.89
  6. Step 6: Final answer
    x = 660.15

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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.