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Finding the Third Proportional to 78,840 and 121,186

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Solution

The third proportional to 78,840 and 121,186 is: 186,276.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,840 : 121,186 = 121,186 : x
  2. Step 2: Convert to fraction form
    78,840/121,186 = 121,186/x
  3. Step 3: Cross multiply
    78,840x = 121,186 × 121,186
  4. Step 4: Simplify right side
    78,840x = 14,686,046,596
  5. Step 5: Solve for x
    x = 14,686,046,596/78,840
  6. Step 6: Final answer
    x = 186,276.59

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.