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Finding the Third Proportional to 55,911 and 121,290

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Solution

The third proportional to 55,911 and 121,290 is: 263,119.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,911 : 121,290 = 121,290 : x
  2. Step 2: Convert to fraction form
    55,911/121,290 = 121,290/x
  3. Step 3: Cross multiply
    55,911x = 121,290 × 121,290
  4. Step 4: Simplify right side
    55,911x = 14,711,264,100
  5. Step 5: Solve for x
    x = 14,711,264,100/55,911
  6. Step 6: Final answer
    x = 263,119.32

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.