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Finding the Fourth Proportional to 81,201.69, 121,798.49 and 28,606.77

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Solution

The fourth proportional to 81,201.69, 121,798.49 and 28,606.77 is: 42,908.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,201.69 : 121,798.49 = 28,606.77 : x
  2. Step 2: Convert to fraction form
    81,201.69/121,798.49 = 28,606.77/x
  3. Step 3: Cross multiply
    81,201.69x = 121,798.49 × 28,606.77
  4. Step 4: Simplify right side
    81,201.69x = 3,484,261,246.74
  5. Step 5: Solve for x
    x = 3,484,261,246.74/81,201.69
  6. Step 6: Final answer
    x = 42,908.73

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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.