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Finding the Third Proportional to 128,812.50 and 189,487.50

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Solution

The third proportional to 128,812.50 and 189,487.50 is: 278,742.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,812.50 : 189,487.50 = 189,487.50 : x
  2. Step 2: Convert to fraction form
    128,812.50/189,487.50 = 189,487.50/x
  3. Step 3: Cross multiply
    128,812.50x = 189,487.50 × 189,487.50
  4. Step 4: Simplify right side
    128,812.50x = 35,905,512,656.25
  5. Step 5: Solve for x
    x = 35,905,512,656.25/128,812.50
  6. Step 6: Final answer
    x = 278,742.46

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.