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Finding the Fourth Proportional to 81,998.10, 122,997.15 and 74,124.90

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Solution

The fourth proportional to 81,998.10, 122,997.15 and 74,124.90 is: 111,187.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,998.10 : 122,997.15 = 74,124.90 : x
  2. Step 2: Convert to fraction form
    81,998.10/122,997.15 = 74,124.90/x
  3. Step 3: Cross multiply
    81,998.10x = 122,997.15 × 74,124.90
  4. Step 4: Simplify right side
    81,998.10x = 9,117,151,444.04
  5. Step 5: Solve for x
    x = 9,117,151,444.04/81,998.10
  6. Step 6: Final answer
    x = 111,187.35

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1.5x scale

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.