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Finding the Fourth Proportional to 717.98, 990.80 and 403.25

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Solution

The fourth proportional to 717.98, 990.80 and 403.25 is: 556.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.98 : 990.80 = 403.25 : x
  2. Step 2: Convert to fraction form
    717.98/990.80 = 403.25/x
  3. Step 3: Cross multiply
    717.98x = 990.80 × 403.25
  4. Step 4: Simplify right side
    717.98x = 399,540.10
  5. Step 5: Solve for x
    x = 399,540.10/717.98
  6. Step 6: Final answer
    x = 556.48

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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.