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Finding the Fourth Proportional to 1,002.21, 1,383.41 and 722.61

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Solution

The fourth proportional to 1,002.21, 1,383.41 and 722.61 is: 997.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,002.21 : 1,383.41 = 722.61 : x
  2. Step 2: Convert to fraction form
    1,002.21/1,383.41 = 722.61/x
  3. Step 3: Cross multiply
    1,002.21x = 1,383.41 × 722.61
  4. Step 4: Simplify right side
    1,002.21x = 999,662.29
  5. Step 5: Solve for x
    x = 999,662.29/1,002.21
  6. Step 6: Final answer
    x = 997.46

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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.