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Finding the Fourth Proportional to 718.71, 991.79 and 439.41

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Solution

The fourth proportional to 718.71, 991.79 and 439.41 is: 606.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.71 : 991.79 = 439.41 : x
  2. Step 2: Convert to fraction form
    718.71/991.79 = 439.41/x
  3. Step 3: Cross multiply
    718.71x = 991.79 × 439.41
  4. Step 4: Simplify right side
    718.71x = 435,801.89
  5. Step 5: Solve for x
    x = 435,801.89/718.71
  6. Step 6: Final answer
    x = 606.37

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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.