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Finding the Third Proportional to 869.48 and 1,218.80

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Solution

The third proportional to 869.48 and 1,218.80 is: 1,708.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.48 : 1,218.80 = 1,218.80 : x
  2. Step 2: Convert to fraction form
    869.48/1,218.80 = 1,218.80/x
  3. Step 3: Cross multiply
    869.48x = 1,218.80 × 1,218.80
  4. Step 4: Simplify right side
    869.48x = 1,485,465.82
  5. Step 5: Solve for x
    x = 1,485,465.82/869.48
  6. Step 6: Final answer
    x = 1,708.44

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.