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Finding the Fourth Proportional to 438.20, 657.37 and 149.57

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Solution

The fourth proportional to 438.20, 657.37 and 149.57 is: 224.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.20 : 657.37 = 149.57 : x
  2. Step 2: Convert to fraction form
    438.20/657.37 = 149.57/x
  3. Step 3: Cross multiply
    438.20x = 657.37 × 149.57
  4. Step 4: Simplify right side
    438.20x = 98,319.54
  5. Step 5: Solve for x
    x = 98,319.54/438.20
  6. Step 6: Final answer
    x = 224.37

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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.