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Finding the Fourth Proportional to 716.36, 988.56 and 401.68

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Solution

The fourth proportional to 716.36, 988.56 and 401.68 is: 554.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.36 : 988.56 = 401.68 : x
  2. Step 2: Convert to fraction form
    716.36/988.56 = 401.68/x
  3. Step 3: Cross multiply
    716.36x = 988.56 × 401.68
  4. Step 4: Simplify right side
    716.36x = 397,084.78
  5. Step 5: Solve for x
    x = 397,084.78/716.36
  6. Step 6: Final answer
    x = 554.31

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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.