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Finding the Fourth Proportional to 81,200.14, 121,785.80 and 22,040.40

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Solution

The fourth proportional to 81,200.14, 121,785.80 and 22,040.40 is: 33,056.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,200.14 : 121,785.80 = 22,040.40 : x
  2. Step 2: Convert to fraction form
    81,200.14/121,785.80 = 22,040.40/x
  3. Step 3: Cross multiply
    81,200.14x = 121,785.80 × 22,040.40
  4. Step 4: Simplify right side
    81,200.14x = 2,684,207,746.32
  5. Step 5: Solve for x
    x = 2,684,207,746.32/81,200.14
  6. Step 6: Final answer
    x = 33,056.69

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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.