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Finding the Fourth Proportional to 717.99, 991.02 and 438.41

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Solution

The fourth proportional to 717.99, 991.02 and 438.41 is: 605.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.99 : 991.02 = 438.41 : x
  2. Step 2: Convert to fraction form
    717.99/991.02 = 438.41/x
  3. Step 3: Cross multiply
    717.99x = 991.02 × 438.41
  4. Step 4: Simplify right side
    717.99x = 434,473.08
  5. Step 5: Solve for x
    x = 434,473.08/717.99
  6. Step 6: Final answer
    x = 605.12

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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.