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Finding the Fourth Proportional to 716.28, 988.48 and 401.61

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Solution

The fourth proportional to 716.28, 988.48 and 401.61 is: 554.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.28 : 988.48 = 401.61 : x
  2. Step 2: Convert to fraction form
    716.28/988.48 = 401.61/x
  3. Step 3: Cross multiply
    716.28x = 988.48 × 401.61
  4. Step 4: Simplify right side
    716.28x = 396,986.53
  5. Step 5: Solve for x
    x = 396,986.53/716.28
  6. Step 6: Final answer
    x = 554.23

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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.