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Finding the Fourth Proportional to 718.92, 991.98 and 439.07

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Solution

The fourth proportional to 718.92, 991.98 and 439.07 is: 605.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.92 : 991.98 = 439.07 : x
  2. Step 2: Convert to fraction form
    718.92/991.98 = 439.07/x
  3. Step 3: Cross multiply
    718.92x = 991.98 × 439.07
  4. Step 4: Simplify right side
    718.92x = 435,543.70
  5. Step 5: Solve for x
    x = 435,543.70/718.92
  6. Step 6: Final answer
    x = 605.83

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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.