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Finding the Fourth Proportional to 727.92, 1,004.76 and 478.80

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Solution

The fourth proportional to 727.92, 1,004.76 and 478.80 is: 660.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.92 : 1,004.76 = 478.80 : x
  2. Step 2: Convert to fraction form
    727.92/1,004.76 = 478.80/x
  3. Step 3: Cross multiply
    727.92x = 1,004.76 × 478.80
  4. Step 4: Simplify right side
    727.92x = 481,079.09
  5. Step 5: Solve for x
    x = 481,079.09/727.92
  6. Step 6: Final answer
    x = 660.90

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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.