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Finding the Third Proportional to 619.13 and 869.81

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Solution

The third proportional to 619.13 and 869.81 is: 1,222.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.13 : 869.81 = 869.81 : x
  2. Step 2: Convert to fraction form
    619.13/869.81 = 869.81/x
  3. Step 3: Cross multiply
    619.13x = 869.81 × 869.81
  4. Step 4: Simplify right side
    619.13x = 756,573.79
  5. Step 5: Solve for x
    x = 756,573.79/619.13
  6. Step 6: Final answer
    x = 1,222.00

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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.