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Finding the Fourth Proportional to 1,286.64, 1,927.44 and 635.40

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Solution

The fourth proportional to 1,286.64, 1,927.44 and 635.40 is: 951.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.64 : 1,927.44 = 635.40 : x
  2. Step 2: Convert to fraction form
    1,286.64/1,927.44 = 635.40/x
  3. Step 3: Cross multiply
    1,286.64x = 1,927.44 × 635.40
  4. Step 4: Simplify right side
    1,286.64x = 1,224,695.38
  5. Step 5: Solve for x
    x = 1,224,695.38/1,286.64
  6. Step 6: Final answer
    x = 951.86

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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.