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Finding the Fourth Proportional to 1,321.65, 1,823.09 and 849.39

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Solution

The fourth proportional to 1,321.65, 1,823.09 and 849.39 is: 1,171.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.65 : 1,823.09 = 849.39 : x
  2. Step 2: Convert to fraction form
    1,321.65/1,823.09 = 849.39/x
  3. Step 3: Cross multiply
    1,321.65x = 1,823.09 × 849.39
  4. Step 4: Simplify right side
    1,321.65x = 1,548,510.17
  5. Step 5: Solve for x
    x = 1,548,510.17/1,321.65
  6. Step 6: Final answer
    x = 1,171.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.