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Finding the Fourth Proportional to 437.70, 656.56 and 129.55

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Solution

The fourth proportional to 437.70, 656.56 and 129.55 is: 194.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    437.70 : 656.56 = 129.55 : x
  2. Step 2: Convert to fraction form
    437.70/656.56 = 129.55/x
  3. Step 3: Cross multiply
    437.70x = 656.56 × 129.55
  4. Step 4: Simplify right side
    437.70x = 85,055.38
  5. Step 5: Solve for x
    x = 85,055.38/437.70
  6. Step 6: Final answer
    x = 194.32

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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.