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Finding the Fourth Proportional to 81,320.80, 121,743.60 and 57,992.80

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Solution

The fourth proportional to 81,320.80, 121,743.60 and 57,992.80 is: 86,819.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,320.80 : 121,743.60 = 57,992.80 : x
  2. Step 2: Convert to fraction form
    81,320.80/121,743.60 = 57,992.80/x
  3. Step 3: Cross multiply
    81,320.80x = 121,743.60 × 57,992.80
  4. Step 4: Simplify right side
    81,320.80x = 7,060,252,246.08
  5. Step 5: Solve for x
    x = 7,060,252,246.08/81,320.80
  6. Step 6: Final answer
    x = 86,819.76

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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.