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Finding the Fourth Proportional to 869.36, 1,299.10 and 849.92

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Solution

The fourth proportional to 869.36, 1,299.10 and 849.92 is: 1,270.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.36 : 1,299.10 = 849.92 : x
  2. Step 2: Convert to fraction form
    869.36/1,299.10 = 849.92/x
  3. Step 3: Cross multiply
    869.36x = 1,299.10 × 849.92
  4. Step 4: Simplify right side
    869.36x = 1,104,131.07
  5. Step 5: Solve for x
    x = 1,104,131.07/869.36
  6. Step 6: Final answer
    x = 1,270.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.