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Finding the Third Proportional to 85,887 and 128,840

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Solution

The third proportional to 85,887 and 128,840 is: 193,274.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,887 : 128,840 = 128,840 : x
  2. Step 2: Convert to fraction form
    85,887/128,840 = 128,840/x
  3. Step 3: Cross multiply
    85,887x = 128,840 × 128,840
  4. Step 4: Simplify right side
    85,887x = 16,599,745,600
  5. Step 5: Solve for x
    x = 16,599,745,600/85,887
  6. Step 6: Final answer
    x = 193,274.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.