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Finding the Fourth Proportional to 438.42, 657.09 and 243.39

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Solution

The fourth proportional to 438.42, 657.09 and 243.39 is: 364.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.42 : 657.09 = 243.39 : x
  2. Step 2: Convert to fraction form
    438.42/657.09 = 243.39/x
  3. Step 3: Cross multiply
    438.42x = 657.09 × 243.39
  4. Step 4: Simplify right side
    438.42x = 159,929.14
  5. Step 5: Solve for x
    x = 159,929.14/438.42
  6. Step 6: Final answer
    x = 364.79

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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.