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Finding the Fourth Proportional to 81,736, 121,888.73 and 80,988.63

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Solution

The fourth proportional to 81,736, 121,888.73 and 80,988.63 is: 120,774.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,736 : 121,888.73 = 80,988.63 : x
  2. Step 2: Convert to fraction form
    81,736/121,888.73 = 80,988.63/x
  3. Step 3: Cross multiply
    81,736x = 121,888.73 × 80,988.63
  4. Step 4: Simplify right side
    81,736x = 9,871,601,255.14
  5. Step 5: Solve for x
    x = 9,871,601,255.14/81,736
  6. Step 6: Final answer
    x = 120,774.22

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.