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Finding the Fourth Proportional to 81,402.60, 122,103.90 and 74,015.40

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Solution

The fourth proportional to 81,402.60, 122,103.90 and 74,015.40 is: 111,023.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,402.60 : 122,103.90 = 74,015.40 : x
  2. Step 2: Convert to fraction form
    81,402.60/122,103.90 = 74,015.40/x
  3. Step 3: Cross multiply
    81,402.60x = 122,103.90 × 74,015.40
  4. Step 4: Simplify right side
    81,402.60x = 9,037,569,000.06
  5. Step 5: Solve for x
    x = 9,037,569,000.06/81,402.60
  6. Step 6: Final answer
    x = 111,023.10

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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.