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Finding the Fourth Proportional to 81,078.51, 121,624.25 and 28,499.79

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Solution

The fourth proportional to 81,078.51, 121,624.25 and 28,499.79 is: 42,751.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,078.51 : 121,624.25 = 28,499.79 : x
  2. Step 2: Convert to fraction form
    81,078.51/121,624.25 = 28,499.79/x
  3. Step 3: Cross multiply
    81,078.51x = 121,624.25 × 28,499.79
  4. Step 4: Simplify right side
    81,078.51x = 3,466,265,583.91
  5. Step 5: Solve for x
    x = 3,466,265,583.91/81,078.51
  6. Step 6: Final answer
    x = 42,751.96

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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.