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Finding the Fourth Proportional to 1,274.21, 1,911.90 and 786.95

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Solution

The fourth proportional to 1,274.21, 1,911.90 and 786.95 is: 1,180.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.21 : 1,911.90 = 786.95 : x
  2. Step 2: Convert to fraction form
    1,274.21/1,911.90 = 786.95/x
  3. Step 3: Cross multiply
    1,274.21x = 1,911.90 × 786.95
  4. Step 4: Simplify right side
    1,274.21x = 1,504,569.71
  5. Step 5: Solve for x
    x = 1,504,569.71/1,274.21
  6. Step 6: Final answer
    x = 1,180.79

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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.