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Finding the Fourth Proportional to 81,208.68, 121,781.76 and 27,890.72

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Solution

The fourth proportional to 81,208.68, 121,781.76 and 27,890.72 is: 41,825.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,208.68 : 121,781.76 = 27,890.72 : x
  2. Step 2: Convert to fraction form
    81,208.68/121,781.76 = 27,890.72/x
  3. Step 3: Cross multiply
    81,208.68x = 121,781.76 × 27,890.72
  4. Step 4: Simplify right side
    81,208.68x = 3,396,580,969.27
  5. Step 5: Solve for x
    x = 3,396,580,969.27/81,208.68
  6. Step 6: Final answer
    x = 41,825.34

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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.