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Finding the Third Proportional to 77,800.50 and 128,263.50

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Solution

The third proportional to 77,800.50 and 128,263.50 is: 211,457.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,800.50 : 128,263.50 = 128,263.50 : x
  2. Step 2: Convert to fraction form
    77,800.50/128,263.50 = 128,263.50/x
  3. Step 3: Cross multiply
    77,800.50x = 128,263.50 × 128,263.50
  4. Step 4: Simplify right side
    77,800.50x = 16,451,525,432.25
  5. Step 5: Solve for x
    x = 16,451,525,432.25/77,800.50
  6. Step 6: Final answer
    x = 211,457.84

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Why These Related Problems?

These problems maintain the same ratio (1.65) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.