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Finding the Fourth Proportional to 438.78, 656.80 and 328.44

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Solution

The fourth proportional to 438.78, 656.80 and 328.44 is: 491.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.78 : 656.80 = 328.44 : x
  2. Step 2: Convert to fraction form
    438.78/656.80 = 328.44/x
  3. Step 3: Cross multiply
    438.78x = 656.80 × 328.44
  4. Step 4: Simplify right side
    438.78x = 215,719.39
  5. Step 5: Solve for x
    x = 215,719.39/438.78
  6. Step 6: Final answer
    x = 491.63

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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.