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Finding the Fourth Proportional to 1,270.87, 1,906.21 and 437.85

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Solution

The fourth proportional to 1,270.87, 1,906.21 and 437.85 is: 656.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.87 : 1,906.21 = 437.85 : x
  2. Step 2: Convert to fraction form
    1,270.87/1,906.21 = 437.85/x
  3. Step 3: Cross multiply
    1,270.87x = 1,906.21 × 437.85
  4. Step 4: Simplify right side
    1,270.87x = 834,631.86
  5. Step 5: Solve for x
    x = 834,631.86/1,270.87
  6. Step 6: Final answer
    x = 656.74

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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.