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Finding the Third Proportional to 59,989 and 128,705

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Solution

The third proportional to 59,989 and 128,705 is: 276,133.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    59,989 : 128,705 = 128,705 : x
  2. Step 2: Convert to fraction form
    59,989/128,705 = 128,705/x
  3. Step 3: Cross multiply
    59,989x = 128,705 × 128,705
  4. Step 4: Simplify right side
    59,989x = 16,564,977,025
  5. Step 5: Solve for x
    x = 16,564,977,025/59,989
  6. Step 6: Final answer
    x = 276,133.57

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.