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Finding the Fourth Proportional to 1,286.00, 1,928.75 and 627.21

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Solution

The fourth proportional to 1,286.00, 1,928.75 and 627.21 is: 940.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.00 : 1,928.75 = 627.21 : x
  2. Step 2: Convert to fraction form
    1,286.00/1,928.75 = 627.21/x
  3. Step 3: Cross multiply
    1,286.00x = 1,928.75 × 627.21
  4. Step 4: Simplify right side
    1,286.00x = 1,209,731.29
  5. Step 5: Solve for x
    x = 1,209,731.29/1,286.00
  6. Step 6: Final answer
    x = 940.70

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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.