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Finding the Fourth Proportional to 712.19, 982.77 and 393.10

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Solution

The fourth proportional to 712.19, 982.77 and 393.10 is: 542.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.19 : 982.77 = 393.10 : x
  2. Step 2: Convert to fraction form
    712.19/982.77 = 393.10/x
  3. Step 3: Cross multiply
    712.19x = 982.77 × 393.10
  4. Step 4: Simplify right side
    712.19x = 386,321.97
  5. Step 5: Solve for x
    x = 386,321.97/712.19
  6. Step 6: Final answer
    x = 542.44

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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.