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Finding the Fourth Proportional to 1,286.99, 1,931.50 and 670.88

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Solution

The fourth proportional to 1,286.99, 1,931.50 and 670.88 is: 1,006.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.99 : 1,931.50 = 670.88 : x
  2. Step 2: Convert to fraction form
    1,286.99/1,931.50 = 670.88/x
  3. Step 3: Cross multiply
    1,286.99x = 1,931.50 × 670.88
  4. Step 4: Simplify right side
    1,286.99x = 1,295,806.61
  5. Step 5: Solve for x
    x = 1,295,806.61/1,286.99
  6. Step 6: Final answer
    x = 1,006.85

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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.