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Finding the Fourth Proportional to 1,286.60, 1,928.42 and 637.76

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Solution

The fourth proportional to 1,286.60, 1,928.42 and 637.76 is: 955.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.60 : 1,928.42 = 637.76 : x
  2. Step 2: Convert to fraction form
    1,286.60/1,928.42 = 637.76/x
  3. Step 3: Cross multiply
    1,286.60x = 1,928.42 × 637.76
  4. Step 4: Simplify right side
    1,286.60x = 1,229,869.14
  5. Step 5: Solve for x
    x = 1,229,869.14/1,286.60
  6. Step 6: Final answer
    x = 955.91

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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.