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Finding the Third Proportional to 509,685 and 809,728.50

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Solution

The third proportional to 509,685 and 809,728.50 is: 1,286,402.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,685 : 809,728.50 = 809,728.50 : x
  2. Step 2: Convert to fraction form
    509,685/809,728.50 = 809,728.50/x
  3. Step 3: Cross multiply
    509,685x = 809,728.50 × 809,728.50
  4. Step 4: Simplify right side
    509,685x = 655,660,243,712.25
  5. Step 5: Solve for x
    x = 655,660,243,712.25/509,685
  6. Step 6: Final answer
    x = 1,286,402.86

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.