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Finding the Fourth Proportional to 1,286.77, 1,928.61 and 916

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Solution

The fourth proportional to 1,286.77, 1,928.61 and 916 is: 1,372.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.77 : 1,928.61 = 916 : x
  2. Step 2: Convert to fraction form
    1,286.77/1,928.61 = 916/x
  3. Step 3: Cross multiply
    1,286.77x = 1,928.61 × 916
  4. Step 4: Simplify right side
    1,286.77x = 1,766,606.76
  5. Step 5: Solve for x
    x = 1,766,606.76/1,286.77
  6. Step 6: Final answer
    x = 1,372.90

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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.