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Finding the Fourth Proportional to 81,403.58, 122,140.50 and 43,956.20

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Solution

The fourth proportional to 81,403.58, 122,140.50 and 43,956.20 is: 65,953.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,403.58 : 122,140.50 = 43,956.20 : x
  2. Step 2: Convert to fraction form
    81,403.58/122,140.50 = 43,956.20/x
  3. Step 3: Cross multiply
    81,403.58x = 122,140.50 × 43,956.20
  4. Step 4: Simplify right side
    81,403.58x = 5,368,832,246.10
  5. Step 5: Solve for x
    x = 5,368,832,246.10/81,403.58
  6. Step 6: Final answer
    x = 65,953.27

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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.