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Finding the Fourth Proportional to 717.97, 990.86 and 403.25

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Solution

The fourth proportional to 717.97, 990.86 and 403.25 is: 556.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.97 : 990.86 = 403.25 : x
  2. Step 2: Convert to fraction form
    717.97/990.86 = 403.25/x
  3. Step 3: Cross multiply
    717.97x = 990.86 × 403.25
  4. Step 4: Simplify right side
    717.97x = 399,564.76
  5. Step 5: Solve for x
    x = 399,564.76/717.97
  6. Step 6: Final answer
    x = 556.52

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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.