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Finding the Fourth Proportional to 437.72, 656.49 and 129.60

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Solution

The fourth proportional to 437.72, 656.49 and 129.60 is: 194.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    437.72 : 656.49 = 129.60 : x
  2. Step 2: Convert to fraction form
    437.72/656.49 = 129.60/x
  3. Step 3: Cross multiply
    437.72x = 656.49 × 129.60
  4. Step 4: Simplify right side
    437.72x = 85,081.10
  5. Step 5: Solve for x
    x = 85,081.10/437.72
  6. Step 6: Final answer
    x = 194.37

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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.