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Finding the Fourth Proportional to 718.05, 990.85 and 438.33

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Solution

The fourth proportional to 718.05, 990.85 and 438.33 is: 604.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.05 : 990.85 = 438.33 : x
  2. Step 2: Convert to fraction form
    718.05/990.85 = 438.33/x
  3. Step 3: Cross multiply
    718.05x = 990.85 × 438.33
  4. Step 4: Simplify right side
    718.05x = 434,317.15
  5. Step 5: Solve for x
    x = 434,317.15/718.05
  6. Step 6: Final answer
    x = 604.86

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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.