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Finding the Fourth Proportional to 718.68, 991.84 and 438.94

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Solution

The fourth proportional to 718.68, 991.84 and 438.94 is: 605.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.68 : 991.84 = 438.94 : x
  2. Step 2: Convert to fraction form
    718.68/991.84 = 438.94/x
  3. Step 3: Cross multiply
    718.68x = 991.84 × 438.94
  4. Step 4: Simplify right side
    718.68x = 435,358.25
  5. Step 5: Solve for x
    x = 435,358.25/718.68
  6. Step 6: Final answer
    x = 605.77

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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.