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Finding the Fourth Proportional to 712.45, 982.78 and 447.28

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Solution

The fourth proportional to 712.45, 982.78 and 447.28 is: 616.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.45 : 982.78 = 447.28 : x
  2. Step 2: Convert to fraction form
    712.45/982.78 = 447.28/x
  3. Step 3: Cross multiply
    712.45x = 982.78 × 447.28
  4. Step 4: Simplify right side
    712.45x = 439,577.84
  5. Step 5: Solve for x
    x = 439,577.84/712.45
  6. Step 6: Final answer
    x = 616.99

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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.