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Finding the Third Proportional to 77,818 and 121,588

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Solution

The third proportional to 77,818 and 121,588 is: 189,977.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,818 : 121,588 = 121,588 : x
  2. Step 2: Convert to fraction form
    77,818/121,588 = 121,588/x
  3. Step 3: Cross multiply
    77,818x = 121,588 × 121,588
  4. Step 4: Simplify right side
    77,818x = 14,783,641,744
  5. Step 5: Solve for x
    x = 14,783,641,744/77,818
  6. Step 6: Final answer
    x = 189,977.15

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.