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Finding the Fourth Proportional to 717.99, 990.86 and 403.26

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Solution

The fourth proportional to 717.99, 990.86 and 403.26 is: 556.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.99 : 990.86 = 403.26 : x
  2. Step 2: Convert to fraction form
    717.99/990.86 = 403.26/x
  3. Step 3: Cross multiply
    717.99x = 990.86 × 403.26
  4. Step 4: Simplify right side
    717.99x = 399,574.20
  5. Step 5: Solve for x
    x = 399,574.20/717.99
  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.