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Finding the Fourth Proportional to 81,109.68, 111,912.21 and 49,276.68

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Solution

The fourth proportional to 81,109.68, 111,912.21 and 49,276.68 is: 67,990.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,109.68 : 111,912.21 = 49,276.68 : x
  2. Step 2: Convert to fraction form
    81,109.68/111,912.21 = 49,276.68/x
  3. Step 3: Cross multiply
    81,109.68x = 111,912.21 × 49,276.68
  4. Step 4: Simplify right side
    81,109.68x = 5,514,662,160.26
  5. Step 5: Solve for x
    x = 5,514,662,160.26/81,109.68
  6. Step 6: Final answer
    x = 67,990.19

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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.