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Finding the Fourth Proportional to 712, 982.56 and 401.60

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Solution

The fourth proportional to 712, 982.56 and 401.60 is: 554.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    712 : 982.56 = 401.60 : x
  2. Step 2: Convert to fraction form
    712/982.56 = 401.60/x
  3. Step 3: Cross multiply
    712x = 982.56 × 401.60
  4. Step 4: Simplify right side
    712x = 394,596.10
  5. Step 5: Solve for x
    x = 394,596.10/712
  6. Step 6: Final answer
    x = 554.21

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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.