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Finding the Fourth Proportional to 727.80, 1,002.36 and 663

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Solution

The fourth proportional to 727.80, 1,002.36 and 663 is: 913.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.80 : 1,002.36 = 663 : x
  2. Step 2: Convert to fraction form
    727.80/1,002.36 = 663/x
  3. Step 3: Cross multiply
    727.80x = 1,002.36 × 663
  4. Step 4: Simplify right side
    727.80x = 664,564.68
  5. Step 5: Solve for x
    x = 664,564.68/727.80
  6. Step 6: Final answer
    x = 913.11

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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.