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Finding the Fourth Proportional to 717.99, 991.22 and 438.29

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Solution

The fourth proportional to 717.99, 991.22 and 438.29 is: 605.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.99 : 991.22 = 438.29 : x
  2. Step 2: Convert to fraction form
    717.99/991.22 = 438.29/x
  3. Step 3: Cross multiply
    717.99x = 991.22 × 438.29
  4. Step 4: Simplify right side
    717.99x = 434,441.81
  5. Step 5: Solve for x
    x = 434,441.81/717.99
  6. Step 6: Final answer
    x = 605.08

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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.