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Finding the Fourth Proportional to 81,391.84, 121,941.96 and 28,767.76

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Solution

The fourth proportional to 81,391.84, 121,941.96 and 28,767.76 is: 43,100.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,391.84 : 121,941.96 = 28,767.76 : x
  2. Step 2: Convert to fraction form
    81,391.84/121,941.96 = 28,767.76/x
  3. Step 3: Cross multiply
    81,391.84x = 121,941.96 × 28,767.76
  4. Step 4: Simplify right side
    81,391.84x = 3,507,997,039.21
  5. Step 5: Solve for x
    x = 3,507,997,039.21/81,391.84
  6. Step 6: Final answer
    x = 43,100.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.