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Finding the Fourth Proportional to 81,492.60, 122,238.90 and 69,828.60

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Solution

The fourth proportional to 81,492.60, 122,238.90 and 69,828.60 is: 104,742.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,492.60 : 122,238.90 = 69,828.60 : x
  2. Step 2: Convert to fraction form
    81,492.60/122,238.90 = 69,828.60/x
  3. Step 3: Cross multiply
    81,492.60x = 122,238.90 × 69,828.60
  4. Step 4: Simplify right side
    81,492.60x = 8,535,771,252.54
  5. Step 5: Solve for x
    x = 8,535,771,252.54/81,492.60
  6. Step 6: Final answer
    x = 104,742.90

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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.