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Finding the Fourth Proportional to 81,164.64, 121,774.64 and 43,728.55

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Solution

The fourth proportional to 81,164.64, 121,774.64 and 43,728.55 is: 65,607.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,164.64 : 121,774.64 = 43,728.55 : x
  2. Step 2: Convert to fraction form
    81,164.64/121,774.64 = 43,728.55/x
  3. Step 3: Cross multiply
    81,164.64x = 121,774.64 × 43,728.55
  4. Step 4: Simplify right side
    81,164.64x = 5,325,028,595.87
  5. Step 5: Solve for x
    x = 5,325,028,595.87/81,164.64
  6. Step 6: Final answer
    x = 65,607.74

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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.