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Finding the Third Proportional to 78,571.69 and 121,636.13

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Solution

The third proportional to 78,571.69 and 121,636.13 is: 188,303.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,571.69 : 121,636.13 = 121,636.13 : x
  2. Step 2: Convert to fraction form
    78,571.69/121,636.13 = 121,636.13/x
  3. Step 3: Cross multiply
    78,571.69x = 121,636.13 × 121,636.13
  4. Step 4: Simplify right side
    78,571.69x = 14,795,346,905.02
  5. Step 5: Solve for x
    x = 14,795,346,905.02/78,571.69
  6. Step 6: Final answer
    x = 188,303.79

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.