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Finding the Fourth Proportional to 727.24, 1,003.32 and 478.68

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Solution

The fourth proportional to 727.24, 1,003.32 and 478.68 is: 660.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.24 : 1,003.32 = 478.68 : x
  2. Step 2: Convert to fraction form
    727.24/1,003.32 = 478.68/x
  3. Step 3: Cross multiply
    727.24x = 1,003.32 × 478.68
  4. Step 4: Simplify right side
    727.24x = 480,269.22
  5. Step 5: Solve for x
    x = 480,269.22/727.24
  6. Step 6: Final answer
    x = 660.40

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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.