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Finding the Fourth Proportional to 81,145.80, 121,661.10 and 31,206.60

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Solution

The fourth proportional to 81,145.80, 121,661.10 and 31,206.60 is: 46,787.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,145.80 : 121,661.10 = 31,206.60 : x
  2. Step 2: Convert to fraction form
    81,145.80/121,661.10 = 31,206.60/x
  3. Step 3: Cross multiply
    81,145.80x = 121,661.10 × 31,206.60
  4. Step 4: Simplify right side
    81,145.80x = 3,796,629,283.26
  5. Step 5: Solve for x
    x = 3,796,629,283.26/81,145.80
  6. Step 6: Final answer
    x = 46,787.75

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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.