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Finding the Fourth Proportional to 1,256.68, 1,882.29 and 768.25

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Solution

The fourth proportional to 1,256.68, 1,882.29 and 768.25 is: 1,150.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.68 : 1,882.29 = 768.25 : x
  2. Step 2: Convert to fraction form
    1,256.68/1,882.29 = 768.25/x
  3. Step 3: Cross multiply
    1,256.68x = 1,882.29 × 768.25
  4. Step 4: Simplify right side
    1,256.68x = 1,446,069.29
  5. Step 5: Solve for x
    x = 1,446,069.29/1,256.68
  6. Step 6: Final answer
    x = 1,150.71

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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.