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Finding the Fourth Proportional to 437.85, 656.69 and 129.70

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Solution

The fourth proportional to 437.85, 656.69 and 129.70 is: 194.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    437.85 : 656.69 = 129.70 : x
  2. Step 2: Convert to fraction form
    437.85/656.69 = 129.70/x
  3. Step 3: Cross multiply
    437.85x = 656.69 × 129.70
  4. Step 4: Simplify right side
    437.85x = 85,170.89
  5. Step 5: Solve for x
    x = 85,170.89/437.85
  6. Step 6: Final answer
    x = 194.52

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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.