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Finding the Third Proportional to 7,689 and 9,859.50

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Solution

The third proportional to 7,689 and 9,859.50 is: 12,642.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,689 : 9,859.50 = 9,859.50 : x
  2. Step 2: Convert to fraction form
    7,689/9,859.50 = 9,859.50/x
  3. Step 3: Cross multiply
    7,689x = 9,859.50 × 9,859.50
  4. Step 4: Simplify right side
    7,689x = 97,209,740.25
  5. Step 5: Solve for x
    x = 97,209,740.25/7,689
  6. Step 6: Final answer
    x = 12,642.70

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.