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Finding the Fourth Proportional to 872.08, 1,308.42 and 438.88

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Solution

The fourth proportional to 872.08, 1,308.42 and 438.88 is: 658.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.08 : 1,308.42 = 438.88 : x
  2. Step 2: Convert to fraction form
    872.08/1,308.42 = 438.88/x
  3. Step 3: Cross multiply
    872.08x = 1,308.42 × 438.88
  4. Step 4: Simplify right side
    872.08x = 574,239.37
  5. Step 5: Solve for x
    x = 574,239.37/872.08
  6. Step 6: Final answer
    x = 658.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.