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Finding the Fourth Proportional to 1,131.79, 1,694.97 and 784.21

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Solution

The fourth proportional to 1,131.79, 1,694.97 and 784.21 is: 1,174.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.79 : 1,694.97 = 784.21 : x
  2. Step 2: Convert to fraction form
    1,131.79/1,694.97 = 784.21/x
  3. Step 3: Cross multiply
    1,131.79x = 1,694.97 × 784.21
  4. Step 4: Simplify right side
    1,131.79x = 1,329,212.42
  5. Step 5: Solve for x
    x = 1,329,212.42/1,131.79
  6. Step 6: Final answer
    x = 1,174.43

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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.