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Finding the Fourth Proportional to 81,302.81, 121,923.90 and 27,979.88

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Solution

The fourth proportional to 81,302.81, 121,923.90 and 27,979.88 is: 41,959.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,302.81 : 121,923.90 = 27,979.88 : x
  2. Step 2: Convert to fraction form
    81,302.81/121,923.90 = 27,979.88/x
  3. Step 3: Cross multiply
    81,302.81x = 121,923.90 × 27,979.88
  4. Step 4: Simplify right side
    81,302.81x = 3,411,416,167.33
  5. Step 5: Solve for x
    x = 3,411,416,167.33/81,302.81
  6. Step 6: Final answer
    x = 41,959.39

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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.