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Finding the Fourth Proportional to 81,100.12, 111,905.40 and 45,288.40

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Solution

The fourth proportional to 81,100.12, 111,905.40 and 45,288.40 is: 62,490.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,100.12 : 111,905.40 = 45,288.40 : x
  2. Step 2: Convert to fraction form
    81,100.12/111,905.40 = 45,288.40/x
  3. Step 3: Cross multiply
    81,100.12x = 111,905.40 × 45,288.40
  4. Step 4: Simplify right side
    81,100.12x = 5,068,016,517.36
  5. Step 5: Solve for x
    x = 5,068,016,517.36/81,100.12
  6. Step 6: Final answer
    x = 62,490.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.