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Finding the Fourth Proportional to 712.13, 982.87 and 401.63

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Solution

The fourth proportional to 712.13, 982.87 and 401.63 is: 554.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.13 : 982.87 = 401.63 : x
  2. Step 2: Convert to fraction form
    712.13/982.87 = 401.63/x
  3. Step 3: Cross multiply
    712.13x = 982.87 × 401.63
  4. Step 4: Simplify right side
    712.13x = 394,744.16
  5. Step 5: Solve for x
    x = 394,744.16/712.13
  6. Step 6: Final answer
    x = 554.32

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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.