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Finding the Fourth Proportional to 727.12, 1,003.53 and 478.81

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Solution

The fourth proportional to 727.12, 1,003.53 and 478.81 is: 660.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.12 : 1,003.53 = 478.81 : x
  2. Step 2: Convert to fraction form
    727.12/1,003.53 = 478.81/x
  3. Step 3: Cross multiply
    727.12x = 1,003.53 × 478.81
  4. Step 4: Simplify right side
    727.12x = 480,500.20
  5. Step 5: Solve for x
    x = 480,500.20/727.12
  6. Step 6: Final answer
    x = 660.83

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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.